5 from 2 votes

Savor this steaming bowl of Vegetarian Udon Soup. This recipe features chewy udon noodles and umami-rich kombu broth, perfect for a quick and wholesome meal!

Looking for easy udon recipes? Try my Kake Udon, Zaru Udon, or Tanuki Udon!

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

Why You Will Love This Recipe

This vegetarian udon soup is perfect for a quick weeknight meal.
You can create a delicious plant-based soup stock alternative with an easy step!
This recipe offers a warm and hearty meal, making it ideal for cold, chilly days.

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 Vegetarian Udon Soup:

Udon noodles: At Japanese grocery stores or Asian markets, you can find udon noodles in different forms – dried, fresh, or frozen. In this recipe, I opt for frozen udon noodles for their quick preparation, requiring just a few minutes of boiling.
Egg, spinach, and scallions for the toppings. I’ll introduce more topping variations in the later section.
Kombu dashi powder, salt, mirin, and soy sauce for the noodle soup. Dashi, a type of soup stock, is the main ingredient in infusing your soup with savory flavors. To simplify the process, I recommend using store-bought kombu dashi powder. However, if it’s unavailable, you can prepare homemade kombu dashi or vegetable broth as a delicious alternative.

How To Make Vegetarian Udon Soup: 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

Boil the spinach and chop it into bite-sized pieces.

Step 2

Boil eggs and cut them in half.

Step 3

Put soup ingredients into a large pot and bring it to a boil.

Step 4

Boil udon noodles.

Serve the noodles in a bowl, pour the soup, and finish it with toppings. Enjoy your Vegetarian Udon Soup while it’s still warm. If you like a spicy kick, top it with a sprinkle of shichimi togarashi, a Japanese spice blend.

Recipe Tips

Adjusting Soup Seasoning: If your udon soup is too salty, you can balance it by diluting it with water. Conversely, if it’s too mild, add more salt to enhance the flavor.
Udon noodles typically take a couple of minutes to cook frozen noodles and around 10 minutes or more for dried or fresh noodles. The cooking time can vary depending on the type and brand of udon noodles, so please follow the package directions.

Topping Variations

You have the flexibility to add various toppings. Here are some choices for enhancing your simple soup.

Bok choy
Snow peas
Green onions
Bean sprouts
Mushrooms
Sesame seeds
Soft-boiled eggs
Silken tofu
Firm tofu

Vegetarian Udon Recipe Variations

Miso Udon Soup – Enhance your soup with the addition of miso paste for a delightful umami flavor.
Vegan Udon Noodle Soup – You can easily make your udon noodle soup into a vegan recipe by replacing the boiled egg with a vegan protein alternative.
Vegetable Yaki Udon – a hearty stir-fried udon noodle dish filled with fresh vegetables, making it a healthy meal choice.
Miso Udon Carbonara – This recipe is an absolute must-try for you if you love creamy udon dishes.

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Easy Vegetarian Udon Soup (Japanese Noodle Recipe)