Chawanmushi is a delicate custard-soup, its name meaning steamed in a tea cup. Each portion of the dish is ideally served in a small, lidded cup, either as an appetizer or as a part of a bigger meal. The custard usually consists of an egg mixture that can be flavored with numerous ingredients such as dashi (Japanese stock), soy sauce, mushrooms, tofu, ginko nut, or steamed shrimp.

It is believed that the dish originated in Kyoto and Osaka during the Kansei period, later spreading to Edo and Nagasaki. Chawanmushi can be served hot, warm, or cold, and can be garnished with carrot shavings, Japanese parsley, or even more seafood.

Since it cannot be eaten with chopsticks, it is one of the few Japanese dishes that are traditionally consumed with a spoon.