Pour 4 tbsp dashi stock, 3 tbsp Japanese soy sauce (koikuchi shoyu), 1 tbsp mirin and 1 tsp light brown sugar into a saucepan and boil for 1 minute to burn off the alcohol in the mirin.
If serving cold, add 3 ice cubes to the sauce to quickly cool it and balance the flavor. If serving hot, dilute with hot water instead (or add water before turning off the heat).
Cook 2 portions udon noodles according to the instructions on the packaging. Once cooked, pour through a colander and rinse with fresh water to remove the starch. (Use cold water for cold udon and add a few ice cubes to make them extra cold. For the hot version, rinse with freshly boiled water.)
Divide the noodles and sauce into serving bowls.
Top each portion with your choice of toppings. I used pasteurized egg yolks, finely chopped green onions, tempura flakes (tenkasu), grated ginger root and grated daikon radish (daikon oroshi). (See in post for more ideas.)
Enjoy!
Notes
For serving, layer colorful toppings like egg yolk, green onions, and tempura flakes to create an eye-catching presentation.Fridge storage: Sauce only in airtight container, up to 3 days. Cooked udon noodles not recommended.Meal Prep: Make sauce in larger batches and store in the fridge for up to 3 days. Cook noodles fresh each time.Serving ideas:Crispy Agedashi Dofu, Spinach Ohitashi Salad, Grilled Mackerel (Saba Shioyaki), Japanese grilled salted salmon