This is a small species of these edible bivalve molluscs. They are more delicate that their big brother, but equally delicious. They are cheaper to buy than the big ones and so we would recommend splashing out on these a little. Try adding them to seafood linguine, turning them into tempura or just grilling in their shells under hot grill, with garlic and lemon butter. They cook in no time, 2-3 minutes is probably enough.