Natto butter udon

Name: Natto butter udon
Total time: 10 min
Yield: 1 serving
Ingredients: udon; butter; scallions (optional); eggs (optional); tsuyu / mentsuyu (Japanese noodle sauce; soy sauce + a pinch of sugar works); shio kombu, salted kelp (optional); 1 natto pack (with its sauce + mustard); soy sauce; salt; cooking oil

10 minBeginner scaleBeginner scale 4 of 5Uses raw egg

Ingredients

udon
butter
scallions (optional)
eggs (optional)
tsuyu / mentsuyu (Japanese noodle sauce; soy sauce + a pinch of sugar works)
shio kombu, salted kelp (optional)
1 natto pack (with its sauce + mustard)
soy sauce
salt
cooking oil

Steps

Stir the natto with its scallion-soy sauce and dried scallions.
Boil udon for 1 minute, rinse and drain.
Toss the noodles in melted butter and season with tsuyu.
Plate and top with natto, blanched shio-kombu and chives.
Add the egg yolk and mix before eating.

Recipe source

Source: Pulmuone official blog · 2026 (opens in a new tab)

2026-06-17 · checked 2026-11-04. Steps rewritten in our own words from the original.

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Before you eat

If you take warfarin or another anticoagulant, talk to your doctor or pharmacist before eating natto. Natto is high in vitamin K (600 µg per 100 g, Standard Tables of Food Composition in Japan 2023). Vitamin K intake can change how warfarin works (MFDS label · MedlinePlus). Standard Tables of Food Composition in Japan 2023 (opens in a new tab) MFDS (opens in a new tab) MedlinePlus (opens in a new tab)

Natto is made from soybeans. If you have a soy allergy, don't eat it. Standard Tables of Food Composition in Japan 2023 (opens in a new tab) U.S. FDA (opens in a new tab)

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