Cut beef into smaller, easier to eat pieces if necessary. Finely slice bell peppers.
Parboil bean sprouts. Once done, strain in a colander and set aside.
Heat 2 tablespoons of sesame oil in a frying pan and then add the beef, bell peppers, and bean sprouts. Continuously stir contents of pan. While stirring season with a pinch of salt. Afterwards add in the cooked udon noodles and continue stirring contents.
Combine the seasonings. Add the combined seasonings to the pan and continue stirring. Once seasonings are evenly mixed remove contents of pan from heat and plate. Garnish with white sesame seeds as desired.
Note: You may substitute the Kikkoman® Soy Sauce and Kikkoman® Kotteri Mirin for 3 tablespoons of Kikkoman® Tempura Dipping Sauce or Kikkoman ® Memmi Soup Base