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Oils

©2006 Clove Garden

• Selecting Suitable Oils
• Storing Oils
• Cooking Methods using Oils
• Sauté
• Braising - Stovetop & Oven
• Stewing
• Pan Frying
• Stir Frying
• Roasting
• Baking
• Dressing Salads
• Safety
• Smoke Point and Composition Chart - a comparative summary
• Oils, Fats & Health - raging controversy prevails
• Links - to other Cooking with Oil and Fat sites

Even the most casual cook needs at least two oils: a high temperature oil (400°F+) for deep frying, sauté and stir frying, and a flavorful oil like extra virgin olive oil for salads and low temperature cooking. If I wanted to minimize the number of oils I had on hand, I'd select Butter, Extra Virgin Oil, and Pure Olive Oil (and dark Sesame for Oriental stuff). In actuality, I usually have about a dozen oils.

High heat destroys oils (polyunsaturates faster than others) and the byproducts of breakdown aren't good for you. You can use a high temperature oil at low temperatures (sacrificing flavor) but never use an oil higher than its rated range. With flavorful oils keep well away from the maximum or you will lose the flavor you paid extra for.

Health factors are also a consideration, but intense controversy surrounds these (see our Oils, Fats and Health for details). The chart below serves the three leading theories including the "Anything in Moderation" theory which can select from either column.

Most oils are highly perishable because unsaturated fats are subject to oxidation and rancidity. All contain significant amounts of unsaturated fats (with the notable exception of coconut oil which is darned near eternal). Those high in polyunsaturates are most vulnerable and should be used within 6 months of opening while monounsaturates (Olive Oil) will last a year properly stored.

Properly stored means in a tightly sealed glass jar or oil can in a cool dark place. You can store oils very much longer if you refrigerate them, but all (except Safflower Oil) will solidify to some extent, particularly Olive Oil. This is not damaging and left at room temperature for a while they'll re-liquify. I keep dark Sesame Oil in in the refrigerator, but the rest I use up fast enough to store at room temperature.
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Here a small amount of oil is used at high temperature to quickly brown ingredients. Heat the pan moderately, add the oil and turn up the heat to bring the oil up to near its maximum temperature - but it should not smoke because that damages the oil. Then add the ingredients and leave to brown on one side. Make sure they have plenty of space and don't move them around. When done, turn over to brown the other side, again without moving (for vegetables you will have to move them around more).

Sautéing is a favorite technique for restaurant chefs because it can be very quick and requires only modest attention once you're good at it. Clearly though, sautéing takes a bit more practice than most cooking methods since you have to get the heat and timing right by experience.

The most commonly used oils are olive oil and butter (tasty, but needs more care with the temperature). Obviously other oils can be used as you desire or as called for by the ethnicity of the recipe.

Meats must be tender cuts or they will just toughen, Depending on the recipe they may be floured or not. If not, they should be dry and brushed lightly with oil to prevent sticking. If floured, they should be dried before coating. Meat should be cut thin enough to cook through (for thicker cuts, after sautéing the sauté pan can be moved directly into a hot oven to finish cooking). Vegetables should be cut so they will all cook in the same time, hard vegetables small, soft vegetables larger (or you can cut them uniform and add in stages).

In some cases more ingredients may be added at the end of sauté and the pan may be "deglazed" (by wine or flambé with brandy) to provide additional flavoring, or a sauce may be made.

Equipment: The straight sided covered pan we call a sauté pan is not the ideal device for sautéing and would be more accurately called a "braising pan". The ideal device for sautéing is a shallow pan with sloping sides and very good heat conducting properties (cast iron or aluminum core stainless or such).
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Here you start by frying the main ingredients in a small amount of oil, similar to sauté or stir fry. Ingredients may be added in the process, such as starting with onion, then adding meat, garlic and ginger while continuing to fry. Once you've reached the proper state of brownness, you add a small amount water (and probably a few more ingredients), cover tightly and either simmer on the stovetop, or in a preheated oven until the ingredients are tender. The recipe is finally finished up on the stovetop.

The most common oils are Butter and Olive Oil but others can be used. The main ingredients may be cubed, or may be put in whole.

For Stovetop Braising, after browning put in enough water to come up about 1/3 of the depth of the ingredients. Cover tightly and bring to a simmer. Check the liquid occasionally and turn the ingredients for even cooking. The pot must never run dry. Meat is done when it's fork tender.

For Oven Braising, after the browning step, put in enough water to come up about 1/4 of the depth of the ingredients. Cover tightly and place it in an oven preheated to between 325°F/160°C and 350°F/175°C. Meat is done when it's fork tender.

Whether braised on the stovetop or in the oven, many dishes end up back on the stovetop for finishing. The main ingredients are often removed and the remaining ingredients made into a sauce which then accompanies the main ingredients.

Equipment: For stovetop or oven braising both Dutch ovens and covered sauté pans are used. The Dutch shown here is oval, which I prefer for fit to oblong things, but round ones work as well Covered casseroles can also used if you're sure they're flameproof.
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Stewing is pretty much the same as Braising except you put in enough water or stock to cover the ingredients. Again, it starts on the stovetop with browning, and generally ends on the stovetop with the finish seasoning, reduction or thickening, but the middle portion can be done either on the stovetop or in the oven.
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Pan Frying is similar to sauté except more oil is likely used and the ingredients are moved and turned more often. Generally the ingredients are removed entirely from the frying pan when sufficiently browned and the oil does not become part of a sauce, but may be used to fry additional items.

Again, butter and olive oil are the most used oils but many others including lard, duck fat, goose fat (and even chicken fat if you're Jewish) are frequently used - unless you subscribe firmly to column 2 of the selection chart above.

Equipment: For pan frying, the best pan is a shallow heavy cast iron pan that has been well and properly seasoned. Some people select non-stick pans, but I'm a firm believer that all coatings become worn, torn, scratched, dissolved or burned away in short order - proper seasoning is a constantly renewable non-stick coating. Some others use non-stick for for the single purpose of frying scrambled eggs and avoid it otherwise.

Your beautiful and costly multiply stainless / aluminum / copper frying / sauté pan will be often be useless because what you are trying to fry sticks horribly, while that ugly old cast iron thing works like a dream.
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Stir frying refers to an Asian technique generally executed in a wok, a wide shallow pan of spherical shape. This technique uses a small amount of oil at high temperatures to cook ingredients very quickly preserving flavor and texture. The oil may become part of the recipe if a sauce is made.

"Stir fry" is often used in the context of Western cooking simply because it's easier to say and write than "fry stirring". Oriental stir frying can be done in a sauté pan, but it will require more oil and it may be rather cramped for ingredients that wilt down during cooking - and you can't park ingredients up on the cooler sides as you can with a wok.

A high temperature oil of neutral flavor should be used. Suitable examples are Grapeseed, Peanut and Olive Extra Light or Pomace, all of which have a smoke point well over 400°F/200°C. Start by heating the wok moderately, adding the oil and spreading it up the sides with a spatula to coat well before adding ingredients.

The key to successful stir frying is cutting and organization. Cut ingredients to uniform size and thin enough to cook through very quickly. All preparation must be done in advance because the process is too fast and needs too much attention to allow distractions. If you're having rice it should be completely cooked before starting the stir fry.

Heat the oil very hot for meat (but never smoking which damages the oil) and moderately hot if starting with garlic, ginger and the like. A good strategy is to cook any meat first at high temperature and set it aside. Fry other ingredients at a more moderate temperature, then add the meat back in when about done. Keep in mind the wok must never be overloaded.

If chicken or meat is to be cut thin or shredded, it'll be easier if you sit it in the freezer for 20 minutes or so - enough to stiffen it up a bit but not freeze it. Start adding ingredients with aromatics (garlic, ginger, etc.) and then in order of cooking time. It takes a little practice to judge the timing. Ingredients should be kept in motion most of the time to assure even cooking.

If some ingredients are done while others are not done yet, you can keep the done ones from getting overcooked by parking them up on the cooler sides of the wok. Many recipes call for a finish steaming or braising covered with a tight fitting wok lid and/or making of a sauce just as with sauté.

Equipment: You need a wok, a shallow spherical pan which should be about 14 inches across for home use. To fit it on a Western burner you need a ring stand, and you need a wide spatula that fits the curve of the pan. You also should have a slotted spatula for lifting ingredients out and a special wok lid for finish steaming or braising.

Cast iron woks are very rare, and a bit heavy to work with but do cook evenly. The best available choice is usually a heavy gauge bare carbon steel wok you season well with oil. The one I have was made by Atlas Metal Spinning in San Francisco and is of very fine quality and has a long wooden handle. Most woks have loop handles which must be handled with pot holders or oven mitts.

Non-stick woks are made, but cannot handle the high temperatures and abrasion they are likely to encounter. Stainless woks distribute heat very poorly and don't take a good seasoning. Electric woks don't get hot enough and the heater element is well up from the center making a hot ring up where it should start getting cooler. If you're stuck cooking with electricity, you're better off using a regular burner on high with a ring stand just as with gas.

Western stoves are not ideal for woks. They must be placed on a ring stand and the hottest part will be around the center not the center itself as it would be on the wok's native charcoal stoves. Keeping this in mind, good results can still be achieved.
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For deep frying, heat your oil very hot (but never hotter than its rated for). Take care not to overload it with ingredients so the temperature stays very high. If it falls too low the items fried will become soggy with oil.

Take particular care with meat that has been previously frozen because it exudes a lot of water. It should be thoroughly drained and firmly patted dry with paper towels, then fried in small batches.

In general, 350°F/175°C is a good starting point for most ingredients, but if you're using a 350°F fat like lard, keep it a bit lower. You should be applying enough heat that the oil comes back to temperature by the time the current batch is fully done.

For French fried potatoes, the experts recommend "blanching" by frying at 350°F/175°C until cooked through. When ready to serve do a final browning fry at 365°F/185°C.

For donuts and similar fried bread items a fat solid at room temperature is highly preferred so they don't drip oil all over everything. Lard, tallow and hydrogenated vegetable shortenings are usable. People attempting to avoid saturated fats went to vegetable shortening but got an even worse trans fat problem. "Zero trans fats" vegetable shortenings are now available, but they are, of course, high in saturated fats.

Equipment: in my experience, the Indian kadhai is the ideal deep fry vessel for modest quantities. Its spherical shape has a shorter radius than the Asian wok, thus higher sides which minimize splatter. These same high sides make the kadhai unsuitable for Asian stir fry because you can't park stuff up on the sides.

For real production, the European deep fry pot and basket are best, but you're going to have a lot of oil splatter to clean-up, Do clean up right away because oil starts turning to varnish immediately and will be a lot harder to clean up in a day or two.

Reusing Deep Fry Oil is permissible, within limits, if it hasn't been overheated or otherwise abused and has been filtered and stored carefully. Some oils are much more reusable than others. See the "Oxi" column in our Smoke Point & Composition chart. The lower the number the more durable the oil or fat.

Note that common vegetable oils have very high numbers which means they aren't much good for deep frying. This is why fast food industry, hounded by "health advocates" to stop using beef tallow (very durable) use partially hydrogenated vegetable oils which are similarly durable (see canola vs. canola hydrogenated) - but these are trans fats now considered far more harmful than the saturated fats (beef tallow) they were hounded into giving up.

When reusing oil, don't use oil fish was fried in to fry anything else because it will have a strong fish flavor. In restaurants, oil for potatoes is kept separate, but for the limited reuse in a home kitchen I don't consider this necessary. My rule is to use durable oil and no more than 4 times over the period of a month, discarding it when either has been exceeded or if it has darkened substantially.

To store oil for reuse, let it be hot long enough after removing ingredients to make sure it has no moisture (there should be no bubbling or popping. Filter it through a cloth to remove all food particles and store in a clean sealed jar.
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Roasting usually refers to cooking birds and large pieces of meat in an oven at between 350°F and 400°F. The main source of oils is the fat contained in the bird or meat, but oil, usually Butter but sometimes Lard, Bacon Fat or Olive Oil may be brushed on, usually at the beginning or after turning.

Large vegetables such as squash and eggplants may also be oven roasted, generally in a shallow pan or on a grill. If cut, they will be brushed with butter or oil.Roasting is now also used to cook small cut vegetables that were formerly fried, particularly potatoes, with little oil or fat. First they are cut to size, then tumbled with oil to coat, and roasted on a baking sheet in the oven. For larger cuts, 3/8 inch or so of water may be placed in the pan to cook the potatoes, but all will be evaporated by time roasting is done. Temperatures are not that hot so moderate temperature oils can be used.

Sometimes strips of bacon or lard are draped over the meat and the fat that renders from them keeps the meat coated and moist. Once fat starts to render from the meat itself it may be used for basting (brushing or dripping) the meat itself. Always follow the instructions in the recipe unless you have a very good reason not to.

Equipment: For large birds and meat roasts a special roasting pan is used, a shallow pan which is fitted with either a "V" rack or a flat rack in it to keep the item roasted above the rendered fat and juices (and possible vegetables). Deep covered roasting pans are also used, although these are somewhat out of style right now. A good meat thermometer with a long probe is a must so you can measure the temperature inside the roast to see if it's safely done.
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There are two basic categories of baking: baking dough products like breads, cookies, cakes, pie crusts and the like, and baking casseroles (known as "hot dish" in the U.S. Midwest). Baking casseroles may involve no more oil than a rubbing of butter on the inside of the casserole dish to minimize sticking, and perhaps some oily cheese on top.

Baking breads, cookies, cakes, pie crusts and similar items always involves fats, generally fats solid at room temperature called "shortening", to provide a pleasant texture when cooled. Your choices here are generally Lard, Butter and Vegetable Shortenings (though some people have successfully (for certain values of success) used oils for some baking). For flavor and texture Lard is considered best, preferably "leaf lard" if you can get it.

People trying to avoid saturated fats turned to vegetable shortening and ended up with a trans fats problem that is probably a lot worse. "Zero trans fats" vegetable shortenings are now available but are, of course, high in saturated fats - they're vegetable saturated fats though, which makes some people (especially people at Cargill and Archer Daniels Midland) feel better about them.

Baking dough products is highly critical in measurement, ingredients, temperature and timing, so follow the recipe with exacting care and use a timer if you're likely to get distracted.
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Salads is where to use those "virgin", "cold pressed" or "unrefined" oils that are high in flavor but have a smoke point too low for frying. The run-away favorite here is Extra Virgin Olive Oil - superb flavor and healthy composition both.

The disadvantage of olive oil is that it solidifies in the refrigerator because it is low in polyunsaturated fats. This does no damage, just take your dressing out of the fridge 20 minutes before you need it.

Commercial salad dressings favor Safflower Oil because it is so high in polyunsaturated fats it's still liquid in the refrigerator. This sacrifices flavor compared to Olive, so they add more flavoring ingredients to make up for that. Some theories hold that polyunsaturates aren't good for you but at low salad temperatures the risk is a lot less.

When making salads, you should spin the ingredients dry and then coat with oil before you add vinegar. Oil will not properly coat ingredients that are wet with water or vinegar. In any case, don't apply dressing until you're about ready to serve or the salad will wilt.

Equipment: You really need a salad spinner to get salad greens dry enough for the oil to coat properly. The French wire basket on a chain and the French wire basket with a toy top pump action are absolutely worthless. Many plastic spinners are made that work pretty well, most with a crank action, but if you've got your wits about you you'll get an Oxo (illustrated). You also need a couple jars or bottles to shake dressings up in.
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Cooking with oil at high temperature is dangerous and requires close attention.Connie's brand new stove was hotter than her old one, and she turned her back on a pot of oil heating for deep frying. This splash of aluminum (once a sliding door) is all that remains of Connie's luxury home.

Much more serious is the possibility of severe personal injury from spilled oil or oil that splatters from contact with water. Oils are essential, but so is care.

• Do not overheat oils. When an oil is at its smoke point it's also near its flash point, and an oil fire is very serious and difficult to extinguish. NEVER EVER attempt to put out an oil fire with water, you'll have flaming oil splattered far and wide and probably on you. slide a lid over it or smother it with a cushion. In the oven, keep the oven closed and turn off the heat.
• When adding ingredients to hot oil make sure they're as dry as possible to avoid splattering.
• Never put oil in a wet pan, even with a few droplets. They'll explode while heating, splashing hot oil about.
• Use a cooking vessel that's large enough. Too large is seldom a problem, but too small is disastrous.
• Keep everything clean. Oil and grease buildups, oven or stovetop, can catch fire and be hard to extinguish. Further, cleaning up oil immediately is far easier than cleaning it up later when it's turned to varnish (a mater of a couple days with some oils).
• Keep a fire extinguisher or two handy but not to near the stove. In Connie's case above, she had a brand new industrial size fire extinguisher but it was mounted too close to the stove and she couldn't get to it.
• Turn pot handles in on the stove to prevent accidents, especially if you have children who could grab a handle and spill hot oil all over themselves.
• When setting cookware aside to cool, always leave a potholder on top to remind that it is very hot.
• Wear sensible cloths, being particularly mindful of sleeves that could snag cookware or otherwise get into trouble. Clothing can protect you from small splashed droplets, but for a serious splash you're better off naked because fabric will hold a volume of hot oil until you are cooked.
• If you burn something, don't quench it with water until it has had time to cool. Cold water into a hot pan can splash hot oil, scald with steam, and often damage the pan. If you can, move it to a metal, tile or concrete surface which will help cool it quickly, but not your cutting board which it'll burn a ring into (or melt if plastic).
• Do not use tired oil or oil that has been damaged by heat. It isn't good for you.