Is Miso Vegan? A Kyoto Cook's Honest Answer
Intro
Yes — miso itself is almost always vegan. But miso soup usually is not.
This catches a lot of travelers off guard. The miso paste sitting in the bowl is made from soybeans, salt, and koji — all plant-based. But the moment it becomes miso soup in a restaurant, it is usually mixed with dashi, a stock most often made from fish.
So the honest answer is: it depends on what happens after the paste.
(Note: We also run a 100% plant-based cooking class in Arashiyama, Kyoto, where every ingredient is explained — more on that at the end.)
What miso is actually made of
Miso is a fermented paste, and traditional miso uses just three ingredients: soybeans, salt, and koji (a fermentation culture). All plant-based. The fermentation can take months or even years, which is what gives miso its deep, savory flavor.
In our own kitchen, we use two types: an organic Hatcho miso (made purely from soybeans) and an organic additive-free miso. Both are entirely plant-based. We chose them carefully — not every supermarket miso is, so it is always worth checking the label.
Where it gets complicated: the soup
Here is the part that surprises people. Miso soup is not just miso paste and water. It is miso paste dissolved into dashi — and dashi is traditionally made from katsuobushi (dried bonito flakes) or niboshi (dried sardines). Both are fish.
This means that in most restaurants in Japan, the miso soup served alongside your meal is not vegan, even though the miso itself is. The fish is in the stock, not the paste.
If you are vegan, a bowl of miso soup is one of the most common hidden traps in Japan. It looks plant-based. It usually is not.
What this means for vegan travelers
When eating out, ask whether the miso soup is made with katsuo dashi (fish) or kombu/shiitake dashi (plant-based). Many staff may not know, so when in doubt, it is safest to assume it contains fish.
When cooking at home, miso soup is easy to make vegan: use a dashi made from kombu (kelp) and dried shiitake mushrooms instead of fish. The result is still rich and full of umami — no fish required.
How we use miso in our class
In our vegan cooking class, miso appears in a few places, and all of them are 100% plant-based.
For our vegan miso ramen, we blend our two misos together to build a broth that is deep, warming, and rich — without a single animal ingredient.
As a topping, we make a plant-based "meat" miso using firm tofu. We freeze the tofu first, then thaw it, squeeze out the water, and crumble it by hand. Freezing changes the texture so it resembles ground meat — a technique some of our vegan guests already know and love. Seasoned with Hatcho miso, it brings a savory, satisfying richness to the bowl.
Many of our guests are surprised by Japanese tofu — both its quality and its price. Tofu can be expensive abroad, but here it is an everyday ingredient, and the difference is something people notice immediately.
Every ingredient is explained as we cook, so you always know exactly what is in your food.
Call to action
Want to taste the difference?
If you would like to cook genuinely vegan Japanese food — and finally stop worrying about hidden fish stock — we would love to have you in our kitchen.
Our vegan cooking class in Arashiyama, Kyoto is 100% plant-based and dashi-free. One group per session. Every ingredient explained.
Join Our Vegan Cooking Class in Kyoto →