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Natto
A fermented soybean marvel that defies gravity with its notorious strings.
8 min read · 1,477 words
Natto boldly announces itself with an aroma that can clear a room and stretchy, spider-web-like strands that defy gravity. You might be looking it up because you're curious about traditional Japanese breakfast foods, exploring fermented ingredients with probiotic benefits, or searching for unique plant-based protein sources with impressive nutritional credentials.
I'll walk you through everything you need to know about this divisive delicacy: from selecting quality natto and proper storage to unlocking its unique culinary potential in both traditional and contemporary contexts.
— Leo
Explorefrom the couch
Natto delivers a multidimensional sensory experience that challenges and rewards the adventurous eater. Initially, you'll encounter its signature pungent aroma with notes of ammonia, aged cheese, and coffee. The flavor begins with a mild nuttiness from the soybeans, quickly developing into a complex umami richness reminiscent of strong cheese, accompanied by subtle bitterness and fermented notes. Texturally, natto presents a fascinating paradox: slippery and sticky simultaneously, with elastic strings that stretch between chopsticks and a creamy mouthfeel that contrasts with the tender firmness of the whole beans.
Dating back over 1,000 years, it was likely discovered accidentally when cooked soybeans wrapped in straw (which naturally contains the bacteria) fermented in Japan's humid climate. Historically, it served as a protein-rich preservation method and became a staple in Japanese diets, particularly for breakfast.
There are several varieties of natto, distinguished by bean size, fermentation length, and additives. Small-bean natto (kotsubu) offers a milder flavor and less pronounced texture, making it ideal for natto newcomers. Medium-bean natto (chūtsubu) balances flavor and texture for everyday consumption. Large-bean natto (ōtsubu) delivers the boldest flavor and chewiest texture for natto enthusiasts. Black soybean natto (kuromame natto) provides a sweeter, nuttier profile often used in specialty dishes.
Natto production centers primarily in Japan, where the climate and culinary tradition support its development. Although the fermentation process is relatively straightforward, producing consistently high-quality natto requires precise temperature and humidity control, along with careful selection of soybeans and bacterial strains. The environment significantly impacts quality, with different regions using slightly different fermentation techniques based on local conditions.
Pickat the store
Selecting quality natto requires attention to both appearance and aroma: don't be deterred by its naturally pungent smell, but do learn to distinguish fresh funk from spoilage.
Look for small styrofoam or paper cups sealed with plastic film and a sachet of karashi mustard + soy-based tare. The beans should be glossy, medium-size, and glued together in spider-web strands when you lift them. If the cup feels warm or smells like ammonia, walk away: proper natto is chilled and has a clean, nutty-cocoa aroma.
Look
- Watch out: Color. Look for tan to light brown beans with a slight glossy sheen; avoid dull, discolored, or excessively dark beans.
- Stringiness. Fresh vs. aged: fresh natto forms prominent, elastic strings when stirred, indicating active enzymes and proper fermentation.
- Moisture. Beans should appear moist but not swimming in liquid; excess liquid may indicate improper storage.
Smell
- Pungent but clean. Should have a strong, cheesy aroma reminiscent of aged cheese or fermented sourdough: distinctive but not putrid.
- Aeration test. Stir gently to release aromatics; fresh natto's smell intensifies but remains consistent.
- Watch out: Off odors? Avoid natto with ammoniac, rotten, or chemical smells that suggest spoilage or poor production.
Feel
- Stickiness/Elasticity. When stirred, should create gossamer-like strings that stretch several inches; indicates proper enzyme development.
- Bean integrity. Beans should hold their shape while being soft enough to yield easily when pressed.
- Negative indicator? Watery consistency, brittle beans, or lack of stringiness suggests improper fermentation or age.
Origin
Here's a breakdown of the major producers and what makes their products distinct:
| Flags | Place and description |
|---|---|
| Japan. Home to industrial and artisanal producers with centuries of expertise in natto fermentation | |
| United States. Emerging producer focusing on organic soybeans and targeting health-conscious consumers | |
| South Korea. Produces similar fermented soybean products with regional variations in fermentation methods |
Label
- Brand. Established Japanese brands like Okame, Mizkan, and Takanofoods consistently deliver authentic natto with reliable quality control; look for those with transparent production practices
- Packaging integrity. Natto should be in sealed containers with no leakage; many quality products come with separate sauce and mustard packets
- Production date. Fresher is better; look for recent production dates (within 1-2 weeks) for optimal flavor and texture
- Bean source. Organic and non-GMO soybeans often yield better flavor and fewer potential allergens
- Fermentation method. Traditional natto fermented with rice straw (wara natto) offers more complex flavor profiles than mass-produced varieties
If You Can't Find It
Usein the kitchen
Preparation
- Controlling Intensity. Rinse briefly under cold water to reduce smell and sticky texture; mix with strong flavors like karashi mustard or grated daikon to balance funk
- Common Mistakes. Not mixing enough (reduces beneficial enzyme activation), consuming straight from refrigerator (dampens flavor), or overheating (destroys enzymes and probiotics)
- Infusion Use. Can be mixed into dashi for savory broths, incorporated into salad dressings for probiotic benefits, or blended into dips for umami richness
- Usage Frequency. Best consumed fresh and unheated; adding to hot dishes should be done after cooking to preserve live cultures
- Regional Twist. In northern Japan (Tohoku region), natto tends to be mixed with grated mountain yam (tororo) creating a milder, creamier texture ideal for natto beginners. By contrast, Tokyo-style preparation often includes raw egg and chopped green onion, enhancing the silky texture while tempering the strong flavor. Kansai-region natto is frequently served with citrus and bonito flakes, creating a brighter, more aromatic profile.
Pairings
- Raw egg. The silky richness of egg yolk mellows natto's pungency while enhancing its creamy texture; creates a harmonious protein-rich combination in natto gohan.
- Green onions. Sharp, fresh notes cut through natto's richness while adding aromatic complexity; the slight crunch provides textural contrast to natto's stickiness.
- Karashi mustard. The nasal heat and pungency of Japanese mustard distracts from natto's funk while enhancing its savory aspects; traditional pairing included in most packaged natto.
- Kimchi. The bright acidity and spice of kimchi balances natto's earthiness; both fermented foods create a probiotic powerhouse when combined.
Comparisons
| Ingredient | Intensity | Flavor Profile | Common Uses |
|---|---|---|---|
| Natto | High | Pungent, fermented, cheesy, bitter, umami | Breakfast with rice, sushi, pasta, salads |
| Tempeh | Medium | Nutty, mushroomy, earthy, mild | Stir-fries, sandwiches, grilled as steaks |
| Miso | Medium-High | Salty, umami, sweet, complex | Soups, marinades, dressings, glazes |
| Doenjang | High | Intensely salty, earthy, complex umami | Stews, dipping sauces, marinades |
Substitutes
No Japanese aisle in sight? Make friends with tempeh, firmer, nuttier, zero strings, or grab fermented black beans (douchi) for a saltier, earthy swap. Both share umami depth and probiotic cred. Alternatively, DIY natto kits (spores + soybeans) ship worldwide from Cultures for Health or GEM Cultures; you’ll just need a yogurt maker and 24 hours of patience.
- Miso paste with silken tofu. Approximates flavor when blended, providing fermented notes and creamy texture, though missing the distinctive strings.
- Fermented black beans (douchi). Offers similar flavor intensity and fermented character, useful in stir-fries and sauces but lacks natto's texture.
Storage
- Fresh packaged natto. Refrigerate at 32-40°F (0-4°C) for up to 1 week; consume within 3-4 days after opening for best quality.
- Frozen natto. Store at 0°F (-18°C) or below for up to 3 months; thaw in refrigerator overnight before consuming.
- Opened containers. Transfer leftover natto to an airtight container, refrigerate, and consume within 2 days.
- Room temperature. Never leave natto unrefrigerated for more than 2 hours to prevent bacterial growth and flavor deterioration.
Natto stands as a culinary paradox: simultaneously revered as a nutritional powerhouse and approached with caution by the uninitiated due to its distinctive sensory profile. This fermented treasure transcends its role as mere sustenance in Japanese culture, embodying a tradition of food preservation and nutritional wisdom that spans centuries.
Whether whisked into a traditional breakfast with rice, incorporated into contemporary fusion dishes, or blended into smoothies for its nutritional benefits, natto rewards those who embrace its unique character. For best results, choose fresh natto from reputable producers, mix it thoroughly to develop those signature strings, and pair it with complementary flavors like soy sauce, mustard, and green onions.
Bold, challenging, and undeniably alive: natto might just be the most intriguing fermented food you'll ever learn to love.
— Leo
Last reviewed: February 16, 2026
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Now Send Natto Down the Line
Good cooks don't guess. They share, too!
Help other home chefs discover natto and its secrets.
Now Send Natto Down the Line
Good cooks don't guess. They share, too!
Help other home chefs discover natto and its secrets.