Udon is a type of thick wheat-flour noodle popular in Japanese cuisine. Udon is usually served hot as noodle soup in a mildly flavored broth, in its simplest form as kake udon, served in kakejiru made of dashi, soy sauce (shōyu), and mirin. It is usually topped with thinly chopped scallions. Other common toppings include tempura, often prawn or kakiage (a type of mixed tempura fritter), or abura age, a type of deep-fried tofu pockets seasoned with sugar, mirin, and soy sauce.