Chilled Natto Udon Noodle Bowl

5 from 3 votes

If you’re looking for cold udon recipes with natto, try our favorite Natto Udon Noodle Bowl!

Looking for easy udon recipes? Try my Bukkake Udon, Miso Udon Carbonara, or Zaru Udon!

Chilled Natto Udon Noodle Bowl

I’ll walk you through the ingredients and step-by-step instructions. I hope you enjoy it!

Why You Will Love This Recipe 

  • This chilled natto udon noodle bowl is a nutritious meal!
  • The combination of natto and soft-boiled eggs is absolutely perfect.
  • An easy and quick recipe that is ready in under 10 minutes!

Udon Noodles

Udon noodles, the classic Japanese noodle made with wheat flour and water, are a staple of Japanese cooking. These thick and white noodles have a chewy texture and can be enjoyed both hot and cold. Learn more about udon noodles in “What are Japanese udon noodles: A Beginner’s Guide

Recipe Ingredients

You’ll need the following ingredients to make this Natto Udon:

Natto udon ingredients.
  • Udon noodles: Udon is a thick and chewy noodle made from flour. I use frozen udon noodles in this recipe. Frozen ones may only need one minute of boiling time, making them quick and easy to use.
  • Natto: Use the attached sauce and karashi (Japanese mustard) as well.
  • Eggs: We are gonna make soft-boiled eggs.
  • Mentsuyu (noodle soup): I make it from scratch, which is super easy in this recipe, but you can also buy it at a store. Mentsuyu is made from dashi, which usually contains fish, so if you are vegan/vegetarian, you can substitute it with vegan dashi.
  • Toppings: Scallions and shredded nori.

How To Make Natto Udon: STEP BY STEP 

Here are some quick visual instructions! For the video and all the detailed ingredients and instructions, go to the printable recipe card below.

Step 1

Chop scallions finely.

How to make natto udon.

Step 2

Make soft-boiled eggs.

How to make natto udon.

Step 3

Boil udon noodles.

How to make natto udon.

Step 4

Mix natto and the natto sauce.

Chilled Natto Udon Noodle Bowl

Place udon noodles, natto, scallions, a soft-boiled egg, and shredded nori on a plate, and pour mentsuyu over them.

Get Your Free Vegetarian eBook!

Looking for healthy dinner ideas? I’ve got a free ebook with 10 delicious, easy Japanese vegetarian recipes! Sign up for our newsletter below to get it now!

Vegetarian recipe ebook cover.

Grab a copy of our free

Vegetarian Recipe eBook

Chilled Natto Udon Noodle Bowl

More Natto Recipes You Will Love

Leave a Rating!

I hope you enjoy this Natto Udon! If you try it, don’t forget to leave a rating to share your thoughts—I love hearing from you!

chilled natto udon noodle bowl

Chilled Natto Udon Noodle Bowl

5 from 3 votes
Print Pin Save
Prep: 5 minutes
Cook: 10 minutes
Total: 15 minutes
Servings: 2 servings
Author: Juri Austin
Natto, udon noodles, and egg are all combined in this delicious bowl to make a wholesome meal. If you're interested in natto recipes, try the easy-to-follow Natto udon noodle bowl for an appetizing taste of something new!


  • 2 Udon noodles, 400g
  • 2 pack Natto, 100g (Use the attached sauce and karashi as well)
  • 2 Eggs
  • 2 Scallions
  • Shredded nori, optional

Mentsuyu (Noodle soup)

  • 1 tsp Dashi powder
  • 3 Tbsp Soy sauce
  • 3 Tbsp Mirin
  • 300 ml Water


  • Chop scallions: Chop scallion into small pieces.
  • Make soft-boiled eggs: Boil water in a small pot, turn off the heat, put eggs, and leave for 10 minutes with the lid on.
  • Make mentsuyu: Put all the mentsuyu ingredients in a pot, bring to a boil, then turn the heat off.
  • Boil udon noodles: Boil udon noodles for one minute (if it's frozen udon noodles). Rinse under running water, and drain the water.
  • Mix natto: Mix natto, natto sauce, and karashi(Japanese mustard) together.
  • Serve: Place udon noodles, natto, scallions, soft boiled egg, shredded nori on a plate, and pour mentsuyu over.



  • If your natto doesn’t come with the sauce, you can substitute it with soy sauce.
  • You can buy mentsuyu at a store.


Serving: 1serving | Calories: 395kcal | Carbohydrates: 64.3g | Protein: 17.3g | Fat: 5.6g | Sodium: 1807mg | Sugar: 14.3g
Course: Noodle
Cuisine: Japanese
Keyword: chilled natto udon noodle bowl
Did You Make this recipe?Please Leave a star rating!

Similar Posts

Leave a Reply

Your email address will not be published. Required fields are marked *

Recipe Rating


  1. 5 stars
    I enjoyed this recipe! But there is a small mistake in the instructions. 10 minutes for the eggs will result in hard boiled eggs, not soft boiled.

    1. Hi Philip! Thank you for trying my favorite natto noodle recipe! I apologize for not clarifying to turn off the heat in the instructions, but I have added that now. If you turn off the heat and place the eggs in boiled water, letting them sit, they will turn out as soft-boiled eggs. I hope you have the opportunity to try it again!