Udon Cold Noodles Recipe

Boil noodles

Bring a large pot of water (about 4–6 cups) to a rolling boil. Add the udon noodles, separate gently, and cook according to package instructions (typically 2–4 minutes for fresh, 6–8 minutes for frozen) until tender but still slightly springy.

Shock and chill

While the noodles are boiling, prepare a large bowl filled with cold water and ice (about 4 cups of ice water). When noodles are cooked, immediately drain in a colander and transfer the hot noodles into the ice water. Swirl gently and let sit 1–2 minutes to stop cooking and firm the texture.

Rinse and drain

Using tongs or your hands, gently rub the noodles under the ice water to remove excess starch and cool them thoroughly. Drain well in a colander, shaking off excess water. If serving later, spread on a tray lightly oiled to prevent sticking.

Prep toppings

Julienne the cucumber into thin matchsticks (about 1 cup). Slice scallions thinly on a bias for 3 tablespoons. Shred or cut the nori sheet into thin strips. Toast sesame seeds in a dry skillet over medium heat for 1–2 minutes until fragrant, then remove to cool. If using soft-boiled eggs, prepare them now (see optional egg step).

Optional soft-boiled eggs

To make soft-boiled eggs: bring a small pot of water to a gentle boil, lower in eggs, cook 6–7 minutes for jammy yolks, then transfer to ice bath for 5 minutes, peel and halve. Reserve for plating.

Portion chilled noodles into individual bowls or onto a plate. Arrange cucumber, pickled ginger, scallions, nori strips and halved soft-boiled eggs on top. Sprinkle toasted sesame seeds over the noodles.

Make dipping sauce

Combine 2 cups prepared dashi, 3 tablespoons light soy sauce, 2 tablespoons mirin, 1 teaspoon sugar, 1 teaspoon rice vinegar (optional), and 1 teaspoon grated fresh ginger in a small saucepan. Warm gently over low heat just until sugar dissolves and flavors meld (do not boil long—about 1–2 minutes). Remove from heat and stir in 1 teaspoon toasted sesame oil if using.

Chill sauce

Transfer the sauce to a bowl or airtight container and chill in the refrigerator until cold (at least 20–30 minutes). For faster chilling, set the container in an ice bath and stir until cooled.

Serve the cold udon with the chilled dipping sauce either poured over the noodles as a cold broth or served on the side for dipping. Taste and adjust: add a little more soy for saltiness or a splash of rice vinegar for brightness. Garnish each bowl with extra scallions, sesame seeds, and nori as desired.