The most basic and traditional way of preparing udon it Kake udon where noodles are served in a simple soup stock called kakejiru. Kakejiru is a mixture of three of the most common ingredient in the Japanese cuisine the soy sauce, mirin, and dashi.
UDON ~~~ recipe gateway: this post's link shares recipes from, "harumi’s japanese home cooking". KAKE UDON aka SU UDON bowl constructs and recipes needed for such included + misc info and a different (Udon Noodle Recipes)
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Udon(うどん) Udon is usually served hot as noodle soup in its simplest form as kake udon, in a mildly flavoured broth called kakejiru which is 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 aburaage, a type of deep-fried tofu pockets seasoned with sugar, mirin, and soy sauce.