Autumn Radish and Kombu: A Clear Broth for the Korean Table

Ingredient video accompanying this article.

Autumn radish brings sweetness and a tender bite to soup, while kombu adds a savoury background. This guide explains how to use that pairing as a cooking base, how to keep the radish from falling apart, and when a mushroom alternative is more appropriate.

What the traditional names mean

Radish appears under the name nabok or luobo (蘿蔔); kombu is associated with gonpo or kunbu (昆布) in traditional materia medica. These names help readers locate ingredients in historical writing. A traditional description of an ingredient does not establish a blood-pressure effect for a modern pot of soup. This recipe has no prescribed drinking schedule.

A small cooking batch

  • 200 g fresh radish, washed and cut into even 1–1.5 cm pieces
  • 800 mL water
  • A small piece of food-grade dried kombu, used according to its package's broth directions
  • Optional: sliced green onion and tofu to make a soup

Kombu products differ, so follow the labelled quantity rather than treating the width of a sheet as a reliable weight. If avoiding seaweed, use fresh shiitake mushrooms instead and cook them thoroughly.

How to prepare it

  1. Cut away damaged areas of the radish. Keep the pieces similar in size so they soften together.
  2. Prepare the kombu in water according to its package directions and remove it when directed. Add the radish and simmer gently.
  3. Check a thick piece with a fork. Continue until the centre is tender; the endpoint matters more than a fixed number of minutes. Add water if the pot reduces too far.
  4. For a meal, add tofu, heat it through and finish with green onion. Taste before adding seasoning. Serve beside rice and a cooked vegetable dish.

Texture problems and substitutions

If the radish breaks apart, cut the next batch thicker and reduce vigorous boiling. If the broth tastes weak, use it as the liquid for a vegetable soup instead of reducing it into a concentrated daily drink. Cooked radish can remain in the soup; discarding it is unnecessary.

Kombu is not interchangeable with drinking water

Seaweed can supply substantial iodine, with amounts varying by product. Regular concentrated kombu drinks are not a blood-pressure treatment. People with thyroid conditions or prescribed kidney, fluid or mineral restrictions should check their ingredient choices with their care team. See the NIH iodine fact sheet.

Cool leftovers promptly in shallow containers and refrigerate within two hours. Reheat the portion needed thoroughly. Do not keep a pot at room temperature for sipping throughout the day. USDA storage guidance.

Reviewed October 13, 2026 · YM-LAB Wellness Food.

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