Nimono is a type of Japanese dish that typically consists of one base ingredient that is simmered in shiru stock. The base ingredient is typically a Japanese food like vegetables, tofu, fish, or other seafood. The shiru stock is typically dashi, a simple broth, and is flavored with sake, soy sauce, and is slightly sweetened. The stock can also be flavored with other ingredients like miso or vinegar.
When cooking a nimono dish, the nimono is usually simmered in stock until the base ingredient has soaked up all of the stock or the stock has evaporated.
Misoni, fish simmered in a mixture of seafood and dashi, as well as nikujaga, a beef and potato stew, are two common examples of nimono.