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Kombu seaweed stuffed onigiri, garnished with black sesame seeds
Japanese onigiri made of rice with kombu seaweed filling

Kombu Onigiri (Rice Balls with Soy-Simmered Kelp)

Author: Flavelo
Recipes Vegetarian & Vegan Dishes Main Courses
This Japanese rice ball is more than just a snack: it's a perfect balance of textures and umami. Its soul is 'Kombu Tsukudani', which is sea kelp slowly reduced in soy sauce and spices. An icon of Japanese 'konbini' (convenience store) culture, where the meeting of crunchy seaweed and soft, steaming rice creates harmony. Perfect for hiking because the salty-vinegary treatment naturally preserves it.
🕒 Prep Time 20 mins
🍳 Cook Time 25 mins
⌛ Total Time 1 hr
🍽️ Servings 4 servings
🔥 Calories 210 kcal
🌍 Cuisine Japanese

Ingredients

Equipment Needed

  • Heavy-bottomed pot with lid (for steaming rice)
  • Strainer (for washing rice)
  • Fan or flat plate (for cooling rice)
  • Small bowl of water (for wetting hands)
  • Small pan (for cooking seaweed)

Allergen Information

⚠️ Soy
⚠️ Sesame

Instructions

1 ✓

Place the rice in a strainer and wash gently under cold running water in circular motions 3-4 times until the water runs completely clear.

Tip: Removing excess starch is key so the grains don't become gummy, just sticky (gelatinization).
2 ✓

Put the rice in the pot with the water, bring to a boil, then simmer covered on the lowest heat for 15 minutes. Turn off the heat and let steam covered for another 10 minutes.

Tip: Never lift the lid during this! The trapped steam finishes the cooking, making the rice elastic (retrogradation).
3 ✓

Soak the kombu for 5 minutes, then cut into thin strips. In a small pan, simmer it with a little water, the soy sauce, sugar, and half the vinegar until the liquid thickens to a syrup.

Tip: This is the 'tsukudani' technique: sweet and salty reduction deepens flavors and preserves the ingredient.
4 ✓

Turn the cooked rice out onto a flat tray, sprinkle with the remaining vinegar and salt, and cool to lukewarm with a fan while gently folding it over.

Tip: Quick cooling and acid create a shiny coating on the grains and stop them from getting mushy.
5 ✓

Wet your palms, place a portion of rice on one hand, make an indentation in the center, and fill with the cooled kombu. Shape into a triangle or ball with gentle pressure.

Tip: Press just enough to hold shape, but so it falls apart in your mouth when bitten. Over-compressed onigiri is dense.
6 ✓

Roll the finished onigiri in or sprinkle with black sesame seeds.

Tip: Toast the sesame seeds in a dry pan beforehand for a nutty aroma.

Recipe FAQ

Why is the rice ball falling apart?
You probably didn't use sushi rice, or the rice was too cold when shaping. Lukewarm rice is easier to work with.
Can I store it in the fridge?
Yes, but the rice will get hard. Let it stand at room temperature for 30 minutes before eating, or microwave for 10 seconds.
Can I substitute the kombu?
If you don't have kelp, you can use tuna mayo or pickled plum (umeboshi), but the flavor profile will change.

Ingredients

  • 1 cup Sushi Rice (short-grain)
  • 0.7 oz Dried Kombu Kelp
  • 1 1/4 cups Water (for cooking rice)
  • 2 tbsp Soy Sauce
  • 2 tbsp Rice Vinegar
  • 1 tsp Sugar
  • 1 tsp Salt
  • 1 tbsp Black Sesame Seeds