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How to Make Sea Urchin Sushi with Uni Butter: A Step-by-Step Guide

May 22, 2023

How to Make Sea Urchin Sushi with Uni Butter: A Step-by-Step Guide

Sea Urchin Sushi with Uni Butter

Are you a sushi lover looking to try something new and exciting? Look no further than sea urchin sushi with uni butter! This dish combines the delicate flavors of fresh sea urchin with the rich and creamy taste of uni butter. Not sure where to start? Follow this step-by-step guide to create a restaurant-quality sushi dish in the comfort of your own home.


  • 1/2 cup unsalted butter, softened
  • 1/4 cup uni (sea urchin) roe
  • 1 tablespoon soy sauce
  • 1 tablespoon sake
  • 1 tablespoon mirin
  • 2 cups sushi rice
  • 2 1/2 cups water
  • 1/4 cup rice vinegar
  • 2 tablespoons sugar
  • 1 teaspoon salt
  • 4 sheets of nori (dried seaweed)
  • 4 ounces of fresh sea urchin
  • Wasabi (optional)
  • Pickled ginger (optional)


  1. Begin by making the uni butter. In a small bowl, combine the softened butter, uni roe, soy sauce, sake, and mirin. Mix until well combined.

  2. Next, cook the sushi rice. Rinse the rice in a fine-mesh strainer until the water runs clear. In a medium saucepan, combine the rinsed rice and water. Bring to a boil, then reduce heat to low and cover. Cook for 18 minutes or until the water is fully absorbed.

  3. In a small saucepan, combine the rice vinegar, sugar, and salt. Heat over low heat until the sugar dissolves.

  4. Transfer the cooked rice to a large bowl and add the vinegar mixture. Stir until the rice is well coated.

  5. Cut the sea urchin into bite-sized pieces.

  6. Lay a sheet of nori on a sushi mat or a clean towel. With wet hands, spread a thin layer of rice evenly over the nori, leaving a 1-inch border at the top.

  7. Spread a small amount of uni butter on top of the rice.

  8. Place a few pieces of sea urchin on top of the uni butter.

  9. Using the sushi mat or towel, roll the sushi tightly, pressing down gently to seal.

  10. Repeat the process with the remaining nori, rice, uni butter, and sea urchin.

  11. Slice each sushi roll into bite-sized pieces with a sharp knife.

  12. Serve with wasabi and pickled ginger, if desired.


Q: Can I use frozen sea urchin for this recipe?

A: While fresh sea urchin is ideal, you can use frozen sea urchin as a substitute. Make sure to thaw it completely before using it.

Q: Is uni butter hard to make?

A: Not at all! Uni butter is a simple mixture of softened butter and uni roe, along with a few additional ingredients for flavor.

Q: Can I use regular butter instead of unsalted butter?

A: Yes, you can use regular butter if you prefer. However, be aware that it may affect the overall flavor of the dish.


Sea urchin sushi with uni butter is a delicious and unique sushi dish that is sure to impress your guests. While it may seem intimidating at first, with this step-by-step guide, you'll be able to create

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