I discovered last night that the Wal-Mart supercenter in Gates, NY (near my Rochester home) carries in its seafood department whole, in-the-shell, cooked crawfish. They don't have any uncooked crawfish. If I were to have a crawfish boil, how would I prepare (re-heat) these? They're not frozen. Would I just boil them for a few minutes? Would that make them too tough? Thanks, Doc.