This is a pleasant Summer dish. Tamago dofu, egg tofu. It's not really tofu as it doesn't contain soy at all. It's an egg custard.
It's very easy :
-break eggs, add a similar volume of water, a little soy sauce and a little mirin.
-beat well, pour in a mold and cook in a steamer (about 20 minutes, check with a toothpick)