This section is from the book "Cooking For Profit", by Jessup Whitehead. Also available from Amazon: Cooking for Profit.
Boil the crabs in salted water 20 minutes, open and crack the claws and take out the meat, measure it with a spoon into a bowl and add half as many spoonfuls of fine bread crumbs. For each crab add a teaspoonful of softened butter, same of vinegar mixed with a small tea-spoonful of made mustard, a pinch of salt and cayenne. Pack the mixture in the crab shells and cover the surface with cracker meal, bake brown in a brisk oven and baste the tops once with butter to moisten the breading. Serve in the shells.
 
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