Boil water in a pot. Add udon noodles and cook according to package instructions until tender. Drain well and set aside.
Heat cooking oil in a pan or pot over medium heat. Add sliced onion and cook until softened and translucent. Add thinly sliced beef and cook until browned.
Pour dashi into the pot. Add soy sauce, mirin, sake, and sugar. Bring the mixture to a simmer.
Reduce heat to low. Add Japanese curry roux blocks or powder. Stir continuously until the roux is fully dissolved and the sauce thickens. Add water if the curry is too thick.
Add the cooked udon noodles to the curry broth and stir gently to coat. Heat through briefly. Serve hot in bowls, garnished with chopped green onions and a sprinkle of shichimi togarashi if desired.
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