Prepare the SauceIn a pot, combine the white sauce, water, dashi powder, light soy sauce, and mirin. Heat over low heat, stirring occasionally with a spatula to prevent burning.

Add the UdonOnce the sauce is warm, add the frozen udon directly to the pot. Simmer over medium heat for about 2 minutes.(If cooking a large portion, defrost the udon in the microwave first for more even cooking.)

Mix in the MentaikoRemove the thin membrane from the mentaiko and add the roe to the sauce. Mix well until incorporated.

Variation: For a pop of texture, save some raw mentaiko to use as a fresh topping at the end!

PlatingTransfer to a bowl and top with thinly sliced shiso leaves and shredded nori. It also goes great with Mitsuba (Japanese parsley) or chopped green onions.