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mollusks 
Usually marine-dwelling, soft-bodied invertebrates; some have shells and are sold live.
squid
The edible parts are the tentacles, the body pouch and the ink; often grilled or fried, the lean flesh can occasionally be rubbery.
cuttlefish
The very firm flesh must be pounded before cooking and is delicious stuffed; the ink, or sepia, can also be used to color certain recipes.
octopus
The tough flesh must be tenderized before cooking; it is delicious simmered, grilled or marinated.
