These are called as "Iwagaki." Kaki (or gaki) means oysters in Japanese, and Iwagaki are especially the big ones. The size is usually 15-20cm across with the shell, and of course the inside is a lot bigger compared to the ones I saw in Canada. We eat them in several ways. On the picture, the front, we have an oyster with "Ponzu" sauce (say source with citrus), chive, grated spicy Daikon raddish. On the picture, the right, we have an oyster with cocktail sauce.
Ohhhh they were so delicious, matched very well with a cold glass of champagne.
