U.S.A.
Whole crabs and crab legs and claws are generally eaten with some sort of dip. The famous Joe's Stone Crab restaurant provides a Mustard Sauce which I find completely swamps the flavor of the crab and turns a low calorie dish into a high calorie one. Some provide just melted butter and some lemon wedges which is much better. Some provide just vinegar and I like vinegar but I find it too vinegary for crab. Here's my dip which tones down the vinegar and provides a touch of spices - and you can still taste the crab!