Zaru Soba (Cold Soba Noodles) ざるそば

Jump to Recipe Discussion
  • Light & refreshing, this Zaru Soba (Cold Soba Noodles) will be your summer go-to staple. 10-minute is all you need to whip up this delicious noodle dish.

    Zaru Soba, Cold Buckwheat Noodles with Dipping Sauce on a wooden table.

    What do you usually eat in your country when it’s hot and you have no appetite? In Japan, during the unbearable hot and humid summer, classic cold Japanese noodle, Zaru Soba (ざるそば) is the perfect dish to cool down!

    How To Make Zaru Soba ざるそばの作り方

    Watch on YouTube

    What is Zaru Soba?

    Zaru Soba is a chilled noodle dish made from buckwheat flour and served with soy sauce based dipping sauce called tsuyu (つゆ).

    The word zaru means “a strainer” in Japanese and the name of the dish was derived from the way the noodles are served over a bamboo strainer during Edo Period.

    In today’s recipe, I share how to make homemade dipping sauce, Mentsuyu (noodle soup base), but you can buy a bottle of Mentsuyu in Japanese or Asian grocery store to save time.

    Zaru Soba, Cold Buckwheat Noodles with Dipping Sauce on a wooden table.

    Soba – Buckwheat Noodles

    There are different kinds of soba noodles in Japan, the primary differences between the varieties are texture and flavors.

    Ju-wari Soba (十割そば) is made of 100% buckwheat flour. It has dry and rough texture so the noodles are easily broken compared to Hachi-wari Soba. Ju-wari soba has strong buckwheat aroma and flavor, and it is hard to make Ju-wari Soba because of its dry and crumbly texture.

    Hachi-wari Soba (八割そば) is made from 80% buckwheat flour and 20% wheat flour. Hachi-wari means 80% in Japanese. The noodle is much smoother and it has al dente texture. Unlike Ju-wari Soba, it’s easy to swallow and chew. However, the buckwheat aroma is less than Ju-wari.

    It’s hard to say which soba is tastier and more delicious; it really depends on personal preference.

    By the way, you might have seen packages of green or pink soba noodles in Japanese grocery stores.

    Cha Soba – Green Tea Soba (茶そば) is flavored with small amount of green tea powder in the soba to give a subtle green tea taste and green color.

    Ume Soba – Ume Plum Soba (梅そば) is flavored with Japanese ume plum and have a slight pink color.

    Zaru Soba, Cold Buckwheat Noodles with Dipping Sauce on a wooden table.

    How To Eat Soba Noodles

    At the table, you’ll have a plate of soba noodles, a dipping sauce bowl/cup, a pitcher with tsuyu inside, and small dishes with green onion/wasabi.

    First, fill out a dipping bowl/cup 1/3 full with tsuyu, and add another 1/3 with water. If you like, you can put some condiments of your choice such as green onion and wasabi. Then pick up some soba noodles, dip in the tsuyu briefly, and slurp the noodles up.

    The dipping sauce is very salty, so don’t soak the noodles in the sauce for a long time.

    When you’re done with noodles, you can pour the reserved sobayu (そば湯) – soba cooking water – to the rest of your dipping sauce and enjoy as a soup.

    Tenzaru (天ざる) – Zaru Soba with Tempura

    My mom usually serves with Vegetable Tempura and Shrimp Tempura, but honestly when it’s super hot outside, who wants to deep fry… But if you’re up for a full meal, make some tempura and serve with Zaru Soba!

    Shrimp Tempura on a bamboo basket.

    Shrimp Tempura

    Vegetable Tempura on a white plate.

    Vegetable Tempura

    I hope you will enjoy making this Zaru Soba recipe!  If you try it, don’t forget to share your picture on Instagram, Facebook, or Twitter with #JustOneCookbook.  Thank you so much for reading, and till next time!

    Don’t want to miss a recipe? Sign up for the FREE Just One Cookbook newsletter delivered to your inbox! And stay in touch with me on FacebookGoogle+, Pinterest, and Instagram for all the latest updates.

    4.5 from 12 votes
    Zaru Soba (Cold Buckwheat Noodles with Dipping Sauce) | Easy Japanese Recipes at
    Zaru Soba (Cold Soba Noodles)
    Prep Time
    5 mins
    Cook Time
    10 mins
    Total Time
    15 mins
    Light & refreshing, this Zaru Soba (Cold Soba Noodles) will be your summer go-to staple. 10-minute is all your need to whip up this delicious noodle dish.
    Course: Main Course
    Cuisine: Japanese
    Keyword: cold noodle, soba noodles
    Servings: 4
    Author: Nami
    Mentsuyu (Noodle Soup Base/Dipping Sauce): Makes 1 cup concentrated sauce
    1. Gather all the ingredients.

      Zaru Soba Ingredients
    To Make Dipping Sauce:
    1. In a medium saucepan, add ¼ cup sake and bring it to a boil over medium high heat. Let the alcohol evaporate for a few seconds.
      Zaru Soba New 1
    2. Add ½ cup soy sauce and ½ cup + 1 Tbsp. mirin.
      Zaru Soba New 2
    3. Add 1 x 1 inch (2.5 x 2.5 cm) kombu and 1 cup dried bonito flakes (katsuobushi).
      Zaru Soba New 3
    4. Bring it to boil and cook on low heat for 5 minutes. Turn off the heat and set aside until it cools down. Strain the sauce and set aside. You can keep the sauce in an airtight container and store in the refrigerator for up to a month.
      Zaru Soba New 4
    To Boil Soba Noodles:
    1. Boil a lot of water in a large pot. Unlike pasta, you DO NOT add salt to the water. Add dried soba noodles in the boiling water in circulate motion, separating the noodles from each other. Cook soba noodles according to the package instructions (each brand is slightly different). Once in a while stir the noodles so they don’t stick to each other. Check the tenderness and do not overcook. Before you drain, reserve 1 to 1 ½ cup of soba cooking water "Sobayu" (Read what you use this for in the blog post).
      Zaru Soba New 5
    2. Drain the soba noodles into the sieve and rinse the noodles to get rid of starch under running cold water. This is a very important step.
      Zaru Soba New 6
    3. Shake off the sieve to drain completely and transfer the noodles to the iced water in a large bowl. Set aside till the noodles are cool.
      Zaru Soba New 7
    4. To serve the noodles, place a bamboo sieve or mat over a plate (to catch water from noodles). Put soba noodles and garnish shredded nori sheet on top.
      Zaru Soba New 8
    To Serve:
    1. To make the dipping sauce, combine 1 part of cooled dipping sauce and 3 parts of iced water in a serving pitcher or small individual bowls (sauce:water = 1:3). Check the taste. If it's salty, add more water. If it's weak, add more sauce.

      Zaru Soba New 9
    2. Put chopped green onions and wasabi on a small plate and serve with the soba noodles.
      Zaru Soba New 10
    Recipe Notes

    Recipe by Namiko Chen of Just One Cookbook. All images and content on this site are copyright protected. Please do not use my images without my permission. If you’d like to share this recipe on your site, please re-write the recipe in your own words and link to this post as the original source. Thank you.

    Editor’s Note: The post was originally published in August, 2011.  It’s been updated with new images and video in July, 2016.

    Make It Into A Meal

  • Just One Cookbook Essential Japanese Recipes

    Love Our Recipes?