Japanese natto with karashi mustard & spring onion

Natto is Japanese gastronomy's 'love it or hate it' dish: fermented soybeans famous for their sticky, stringy texture and distinctive smell. This probiotic bomb is incredibly healthy. The secret lies in the stirring: the longer you stir, the frothier and tastier it becomes. The sharpness of mustard (karashi) and the umami of soy sauce tame the character of the fermented beans.
🕒 Prep Time 5 mins
Total Time 5 mins
🍽️ Servings 2 servings
🔥 Calories 210 kcal
🌍 Cuisine Japanese

Ingredients

Equipment Needed

  • Small bowl
  • Chopsticks (best for stirring)

Allergen Information

⚠️ Soya
⚠️ Mustard

Instructions

1

Place the natto in a small bowl. Before seasoning, start stirring vigorously in a circular motion.

Tip: Stirring introduces air, causing the sticky substance (polyglutamate) to turn white and frothy, improving taste perception.
2

When it is whitish and very stringy, add the mustard, soy sauce, and lemon juice. Mix thoroughly.

Tip: Acid (lemon juice) and salt (soy) slightly modify the slime's structure and taste.
3

Stir in the crushed garlic.

4

Sprinkle the top with finely chopped spring onion and coriander, and season with pepper.

Tip: The crunch and pungency of the onion counterbalance the soft beans.
5

Serve on top of hot rice, or on its own for breakfast.

Tip: The steam from hot rice intensifies the aromas, so be prepared for an intense experience!

Recipe FAQ

What is the white layer on the beans?
That is the biofilm of the Bacillus subtilis bacteria performing the fermentation. It is completely edible and very healthy.
It's too slimy, what should I do?
This is the essence of natto (neba-neba). If it bothers you, mix it with hot rice, which dissolves the texture slightly.

Ingredients

  • 2 packs Natto (approx. 40-50g/pack)
  • 1 tsp Japanese mustard (Karashi) or strong mustard
  • 2 tsp Soy sauce
  • 1 stalk Spring onion (finely chopped)
  • 1 sprig Fresh coriander (optional, modern twist)
  • 1 clove Garlic (crushed)
  • 1 tsp Lemon juice
  • 1 pinch Freshly ground pepper