Prepare Dashi: Add water and kombu to a pot. Bring to a gentle boil, then remove the kombu.
Make Tsuyu Base: Add katsuobushi to the dashi. Turn off the heat and let it steep.
Strain Dashi: Strain the dashi through a fine-mesh sieve to remove katsuobushi.
Finish Tsuyu: Return the strained dashi to the pot. Add soy sauce, mirin, and sugar. Bring to a boil, then immediately turn off the heat. Let it cool completely.
Prepare Garnish: Finely chop green onions. Prepare grated ginger and shredded nori seaweed.
Boil Udon: Bring a large pot of water to a rolling boil. Add udon noodles and cook according to package instructions until al dente.
Chill Udon: Drain the cooked udon noodles and rinse thoroughly under cold running water until completely chilled. Drain well.
Serve: Arrange the chilled udon noodles on a zaru (bamboo straining basket) or a plate. Serve with the cooled tsuyu dipping sauce and garnishes (green onions, grated ginger, nori seaweed) on the side.
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