Large sea snails, specifically whelks, can be easily bought from most Japanese fish markets. Their size allows a large piece of mantle meat to be used for sushi. Sea snail has a very firm texture, but not quite as firm as squid or octopus. The taste is very fresh as it is always alive just prior to being sliced for use as sushi. Some people may feel a little uneasy about eating this snail, but it is really no different from any eating any other kind of molluscan shellfish.
Sea snail is also eaten as sashimi, they can also be grilled in their shells on a barbecue. The end of the animal that is found deepest into the shell is rarely eaten as it has a very bitter taste, and in some species can be poisonous.