Miso

What Is Miso?

Miso is a thick, salty, umami-rich Japanese paste made by mixing cooked soybeans with salt and koji (rice or barley fermented with Aspergillus oryzae) and leaving the mixture to ferment for months or even years.

Depending on the fermentation time and koji used, its color ranges from pale yellow to dark brown, and its flavor from mildly sweet to intensely salty. White (shiro), yellow (shinshu), and red (aka) miso are the most common types.

Miso Nutrition Facts

Miso is a fermented product rich in protein and carbohydrates and also very high in sodium. It also contains enzymes from the fermentation process and small amounts of B vitamins.

What Are the Benefits of Miso?

Because of the probiotic cultures formed during fermentation, miso is traditionally considered one of the foods that may support digestion. Its plant-based protein from soy can also be part of a balanced diet.

This is general information; miso is a food, not a medical treatment. Because miso is very high in sodium, people who are sensitive to blood pressure changes are advised to consult a qualified professional about consuming it.

How to Choose Miso

Choose the color of miso according to how you plan to use it: white miso works well in light soups, while red miso is suited to robust sauces.

• Products labeled “unpasteurized” contain more active fermentation cultures.
• If you need gluten-free miso, choose one made with rice instead of barley or with soy alone.
• The package should be undamaged and the color uniform; excessively darkened areas may indicate oxidation.

How to Store Miso

Miso can be kept in the refrigerator for months in a tightly sealed, airtight container without spoiling; its high salt content acts as a natural preservative. A thin layer of darkening on the surface is usually harmless; stir the miso and use it.

Using Miso in the Kitchen

Miso is best known for its use in miso soup. It is also used in marinades, salad dressings, and glazes, and mixed into butter to add umami depth. Rather than adding it directly to boiling water, dissolve it in water that has cooled slightly to preserve its aroma.

How to Make Miso Soup

Bring dashi (Japanese broth) to a gentle boil and remove it from the heat. Dissolve the miso paste in a ladleful of water and stir it into the soup; serve with tofu cubes and chopped green onions. Do not boil the miso, to preserve its live cultures and aroma.

Which Recipes Use Miso?

Miso is commonly used in miso soup, miso-glazed salmon, miso salad dressing, and vegetables with miso butter. Adding a small amount to sauces that balance sweet and salty flavors also contributes umami.

Frequently Asked Questions

What is the difference between white and red miso?

White miso (shiro) ferments for less time and has a mild, less salty flavor. Red miso (aka) ferments for longer, so it has a darker color and a richer, saltier flavor.

Is miso gluten-free?

Miso made only with soybeans and rice koji is gluten-free. Some varieties made with barley koji may contain gluten, so check the label.

Should miso be boiled?

Miso should not be boiled; high heat weakens both its aroma and its live cultures. It is therefore recommended to add it to soup after removing the soup from the heat.

Is miso vegan?

Yes. Traditional miso is vegan because it is made only from soybeans, salt, and koji. However, some ready-made miso soup mixes may contain fish-based dashi powder, so keep that in mind.

How long does opened miso last?

When kept in an airtight container in the refrigerator, miso can stay unspoiled for months, and some varieties for years. Its high salt content acts as a natural preservative.