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Japanese

Zaru Soba

Chilled buckwheat soba is rinsed until firm and glossy, then served on a bamboo tray with cold dipping tsuyu, shredded nori, wasabi, and scallions. Save the hot soba cooking water to soften the remaining sauce at the end, as is traditional.

Zaru Soba — Japanese — ChefSnap
15 minsPrep
15 minsCook
2Serves
EasyDifficulty
430 kcal per serving18g protein 78g carbs 5g fat
Watch it made — Zaru SobaWatch it madeJapaneseCooking101 · 2:45

Ingredients

Method

  1. Place the kombu and 2 cups water in a small saucepan and soak for 20 minutes if time allows.
  2. Warm the kombu water over medium heat and remove the kombu just before the water boils.
  3. Add the katsuobushi, bring just to a simmer, turn off the heat, and let stand for 5 minutes.
  4. Strain the dashi through a fine sieve without pressing the flakes.
  5. In a clean saucepan, bring the mirin to a gentle boil for 30 seconds to cook off the alcohol.
  6. Add 1 cup of the strained dashi, the soy sauce, and sugar, then simmer for 2 minutes.
  7. Cool the dipping sauce completely, then chill it in the refrigerator.
  8. Bring 3 liters of water to a rolling boil in a large pot without adding salt.
  9. Add the soba noodles, stir gently to separate them, and cook according to the package timing until just tender.
  10. Reserve 1 cup of the cloudy soba cooking water for serving as sobayu.
  11. Drain the noodles and rinse them under cold running water, rubbing lightly with your hands to remove surface starch.
  12. Transfer the noodles to ice water for 1 minute, then drain very well.
  13. Arrange the chilled soba on a zaru or flat bamboo tray and sprinkle with shredded nori.
  14. Divide the cold tsuyu between two small dipping cups and serve with sliced negi and wasabi on the side.
  15. To eat, mix a little negi and wasabi into the tsuyu, dip small bundles of soba briefly, and finish by adding hot sobayu to the remaining sauce.

Common questions

Can I substitute the katsuobushi or kombu if I don't have them?

Yes, but the flavor changes. For kombu, use a small piece of dried shiitake for umami. For katsuobushi, use instant dashi powder or a light fish stock. Avoid strong substitutes that overpower the clean soba flavor.

How long should I cook and rinse the soba noodles?

Cook just until tender, usually 4–6 minutes depending on the package. Stir gently at first to prevent clumping. Drain immediately, then rinse thoroughly under cold running water until the noodles feel clean and cool.

What are the most common mistakes when making zaru soba?

Boiling the kombu causes bitterness, pressing the katsuobushi clouds the dashi, and overcooking the noodles makes them mushy. Another common mistake is skipping the cold rinse, which leaves starch on the noodles and dulls the texture.

How do I store the dipping sauce and noodles separately?

Store the chilled dipping sauce in a sealed container in the refrigerator for up to 3 days. Keep cooked noodles separate, lightly oiled only if needed, and eat within 1 day for best texture. Do not store noodles in the sauce.

How should I serve zaru soba with sobayu and toppings?

Serve the noodles cold on a tray or plate with nori and scallions on top. Put the dipping sauce in a small bowl with a little wasabi. Offer sobayu at the end to mix with leftover sauce and drink as a warm finish.