Soak the thin wheat noodles in cold water for 10 minutes to remove starch.
Boil water in a pot and cook the noodles for 3-4 minutes.
Rinse the cooked noodles in cold water and drain well.
Prepare toppings such as cucumber, boiled egg, and beef.
Chill the broth thoroughly.
Place the noodles in a bowl and pour the cold broth over them.
Top with garnishes, mustard, vinegar, and sesame seeds to finish.