Vegan Udon Soup
This vegan udon soup is a light, warming Japanese-style noodle bowl: thick udon noodles served in a clear, gingery broth infused with garlic, rice vinegar, soy sauce and a touch of chili, then finished with green onion, parsley, peanuts and dried wood ear mushrooms. It comes together in one pot in about 20 minutes and needs no special skill, just a handful of real Asian pantry ingredients. Make it when you want something nourishing and slurpable without a long cook.
The soup comes in so many shapes and sizes that I’m sure the answer is always a hard yes. For today’s recipe, I tried to stay as close to the classic as possible because I wanted to get that original taste. It’s a delight to behold and, of course, to taste, and for me it’s one of the best soups. If you love this kind of cooking, my full Asian cuisine guide is a good place to keep exploring.
What goes into the bowl
The magic here is in the broth, and the broth is mostly aromatics. Fresh ginger and whole garlic cloves are simmered in water to build a fragrant base, then fished out so the flavor stays clean rather than sharp. Rice vinegar brings brightness, soy sauce brings the savory depth, and chili paste adds a gentle heat you can dial up or down. A few whole peppercorns round it out.
The udon noodles are the heart of the dish, thick and chewy, and they cook right in the broth so they soak up flavor. The dried wood ear mushrooms are sliced and used as a topping, giving a lovely soft-crunchy texture. Everything else goes on at the end: sliced green onions, chopped parsley, peanuts for crunch, and a few drops of toasted sesame oil for that unmistakable aroma. I just ask you one thing: stay away from the instant packed stuff. For the best results, I strongly recommend you use real Asian ingredients.
How to get the broth right
Give the ginger and garlic time. Simmering them gently on low for a full 15 minutes is what draws their flavor into the water without turning bitter, so resist the urge to rush it on high heat. Once the base tastes fragrant, take the ginger and garlic out before you add the noodles, so they don’t keep intensifying while the soup sits.
Add the soy sauce and udon together, and cook the noodles only until they are just tender, following the timing on your package, since udon varies a lot by brand. Salt at the very end, after the soy sauce has already seasoned the broth, so you don’t overshoot. Keep the sesame oil for the finish rather than the pot: it’s an aromatic drizzle, and heating it dulls that toasty fragrance you want.
Make it your own
Another thing I enjoy about this recipe, and about udon soup in general, is that it’s super customizable. As I said earlier, there are dozens of varieties of udon soup, so once you know the base you can play. If it’s your first time making it, though, I suggest you stick with what I’ve prepared here, to get a sense of what it should look and taste like. A few easy ways to vary it:
- Swap or add toppings: fresh spinach, shredded carrot, corn, or cubes of firm tofu all work well.
- Adjust the heat by adding more or less chili paste, or leave it out for a mild bowl.
- Trade the peanuts for cashews, or leave nuts off entirely for a peanut-free version.
- Use tamari in place of soy sauce if you need it gluten-free (and choose gluten-free noodles too).
What to serve it with
A bowl of udon is light enough to be a starter or filling enough to be a meal, depending on how hungry you are. I often see people getting quite reluctant when it comes to preparing international cuisine, but building a small Asian-style spread is easier than it looks. Pair this soup with sticky Asian garlic tofu for protein, add some vegetarian tempura for crunch, or serve a plate of vegan garlic noodles alongside for a bigger table. If you simply want more brothy bowls in your rotation, my clear soup recipes collection has plenty to choose from.
Storing and making it ahead
Udon soup is best eaten fresh, because the noodles keep drinking up broth and softening as they sit. If you want to prep ahead, my tip is to store the broth and the cooked noodles separately in the fridge for up to two or three days, then reheat the broth and add the noodles when you’re ready to eat. Keep the toppings (green onion, parsley, peanuts, mushrooms, sesame oil) off until serving so they stay fresh and crunchy. I know it’s quite counter-intuitive, but hot foods actually help to cool us down, so don’t save this one only for winter. For another quick brothy bowl to have on hand, try my clear veggie noodle soup or a heartier vegan red lentil soup.
If you make this vegan udon soup, I’d love to know how it turned out for you. Give the recipe a star rating and drop a comment with your favorite toppings or how much chili you dared to add. When you’re done, don’t forget to tell me your impressions, and I will carefully read them while sipping a bowl of amazing soup!
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Vegan Udon Soup
Ingredients
- 4 oz udon noodles
- 4 cups water
- 3 dried wood ear mushrooms sliced
- fresh ginger peeled
- 2 Tbsp rice vinegar
- 2 Tbsp soy sauce
- ½ tsp chili paste
- 2 cloves garlic
- 1 Tbsp sesame oil
- 3-4 green onions sliced
- parsley chopped
- ¼ cup peanuts
- salt
- 4-5 peppercorns
Instructions
- Pour 5 cups of water in a pot.
- Add 2 pieces of fresh ginger (about 4-5 cm each), rice vinegar, chili paste, whole garlic cloves, peppercorns and bring to a boil.
- Let simmer on low for 15 minutes. Take our the ginger and garlic.
- Add the soy sauce and noodles. Cook until the noodles are done (follow the instructions on the package). Salt at the end.
- Serve topped with sliced green onion, chopped parsley, peanuts, sliced dried mushrooms and a few drops of sesame oil.
Frequently Asked Questions
This vegan version is built on a clear broth of water simmered with fresh ginger, garlic, rice vinegar, soy sauce, chili paste and peppercorns. Thick udon noodles cook right in the broth, and the bowl is finished with sliced green onion, chopped parsley, peanuts, sliced dried wood ear mushrooms and a few drops of sesame oil. There is no dashi or fish here, so it stays fully plant-based.
This recipe is vegan, since every ingredient is plant-based and the broth is built from aromatics rather than fish stock. The one thing to check is the udon noodles themselves, because most dried udon is just wheat, water and salt, but some fresh or specialty brands can contain egg. Read the package if you want to be certain it is egg-free.
Yes, with two swaps. Use certified gluten-free noodles in place of standard wheat udon, and use tamari instead of regular soy sauce, since most soy sauce contains wheat. Everything else in the recipe is naturally gluten-free.
Wood ear mushrooms add a soft, slightly crunchy texture, but they are a topping rather than a broth ingredient, so the soup works without them. Sliced shiitake or any Asian mushroom you like makes a good stand-in, or you can simply leave them out. The core flavor comes from the ginger, garlic, soy and vinegar broth.
Simmering the whole ginger pieces and garlic cloves for 15 minutes draws their aroma into the water. Taking them out before adding the noodles keeps the broth clean and balanced, so the flavor does not turn harsh or bitter as the soup sits. It gives you all the fragrance without any raw bite.
It is best fresh, because the noodles keep absorbing broth and softening. To prep ahead, store the broth and cooked noodles separately in the fridge for two to three days, then reheat the broth and combine when serving. Add the green onion, parsley, peanuts, mushrooms and sesame oil only at the end so they stay fresh.
Asian recipe at its best.
I’m glad you liked it!