Cold Soba Noodles
Cold soba noodles, known in Japan as zaru soba, are the ultimate refreshing meal — nutty buckwheat noodles served chilled alongside a sweet-savory mentsuyu dipping sauce. Every bite is brightened with fresh scallions, a touch of wasabi, and strips of nori.
- Prep time
- 10 mins
- Cook time
- 10 mins
- Total time
- 20 mins
- Servings
- 4 servings
- Calories
- 340
Ingredients
- 12 oz (340 g) dried soba noodles
- 1 cup dashi stock (homemade or instant)
- 1/3 cup soy sauce
- 1/4 cup mirin
- 1 tablespoon sugar
- 4 green onions, thinly sliced
- 1 sheet nori seaweed, cut into thin strips
- 1 teaspoon wasabi paste
- 1 tablespoon toasted sesame seeds
- 2 tablespoons grated daikon radish (optional)
- 1 teaspoon grated fresh ginger
- Plenty of ice water, for rinsing
Instructions
- Stir the dashi, soy sauce, mirin, and sugar in a small saucepan. Bring to a gentle simmer for 2 minutes until the sugar dissolves, then cool completely — this is your mentsuyu dipping sauce.
- Bring a large pot of unsalted water to a rolling boil. Add the soba noodles and cook according to the package, usually 4 to 5 minutes, stirring gently so they do not clump.
- Drain the noodles and rinse under cold running water, rubbing them lightly with your hands until completely cool. Shake the colander well to remove all excess water.
- Arrange the chilled noodles on a bamboo mat or a flat plate, or divide among individual bowls.
- Set out small bowls of the dipping sauce and the garnishes — green onions, nori, wasabi, sesame seeds, daikon, and ginger — so everyone seasons their own.
- To eat, pick up a small bundle of noodles, dip just the ends into the sauce, and slurp. Add wasabi in small dabs to the noodles, not the sauce.
Pro tips
- Never boil soba in salted water — the noodles cook in seconds and the salt makes them tough.
- Rinse thoroughly: starch left on the noodles makes them sticky and gummy.
- Chill the dipping sauce fully before serving; lukewarm sauce flattens the whole dish.
- Store-bought concentrated mentsuyu works in a pinch — dilute it 1 part sauce to 2 parts cold water.
Frequently asked questions
Why do my soba noodles taste different from restaurant ones?
The nutty, slightly earthy taste is the signature of buckwheat flour, which is the main ingredient in real soba. Cheap 100 percent wheat noodles labeled soba will taste flat — look for ones listing buckwheat flour first.
How do I keep soba noodles from getting mushy?
Soba turns gummy fast, so rinse the cooked noodles under cold running water until they are completely cool, then shake off all the water. The ice bath stops the cooking instantly and keeps each strand springy.
How long does homemade dipping sauce last?
Mentsuyu keeps about 2 weeks in a sealed jar in the fridge. Warm it gently before using or serve it cold — both are traditional.
Can I add wasabi directly to the sauce?
Yes, with one rule: never mix wasabi into the sauce bowl. Put a dab on top of your noodles and dip — that is the Japanese way and it keeps the wasabi's heat bright.