Steamed Salt Koji-Marinated Salmon Fillet with Shiso & Lemon | A Light and Gut-Friendly Japanese Recipe

Oct 7, 2025
2 min read

Updated: Feb 24

Steamed salmon with lemon slices in a bamboo steamer and on a plate. Text reads: Steamed Salt Koji-Marinated Salmon with Shiso & Lemon.

About This Recipe
Nutrition & Gut Health Benefits
Ingredients
Instructions
Shopping Tips
Serving Suggestions
Final Thoughts

ABOUT THIS RECIPE |

This steamed salmon recipe is one of the best ways to enjoy the natural umami of salt-koji. It’s infused with refreshing shiso and lemon, then gently steamed for a clean and satisfying meal that supports your gut health. No oil needed—just a few ingredients and a bamboo steamer (蒸籠) bring this dish to life.

NUTRITION & GUT HEALTH BENEFITS |

Salmon: Rich in omega-3 fatty acids and protein, which help reduce inflammation and support the gut lining.
Salt-koji: Packed with enzymes that help digest protein and balance your microbiome.
Shiso (Perilla leaf): A traditional Japanese herb known for its antioxidant and antimicrobial properties.
Lemon: Adds a refreshing flavor while helping stimulate digestion and detox pathways.
Gluten-Free, Oil-Free, and Gut-Friendly!

INGREDIENTS |

2 salmon fillets
1.5 tbsp salt-koji
6 shiso leaves
4 lemon slices

INSTRUCTIONS |

Three salmon fillets in a metal tray being brushed with salt koji using a pink brush. The background is a textured, light-colored surface.

1. Rub salmon fillets with salt-koji and marinate in the fridge for 6–12 hours.

Hand placing fresh Shiso leaves in bamboo steamer on marble counter. The setting evokes a natural and organic cooking mood.

2. Line a bamboo steamer (or regular steamer) with parchment paper, then lay down the shiso leaves.

Hands place lemon slices on raw salmon in a bamboo steamer with Shiso leaves, set on a speckled countertop.

3. Place the salmon on top of the shiso, then top each fillet with lemon slices.

Steaming salmon with lemon slices and Shiso leaves in a bamboo steamer over boiling water on a stove. Steam rising, creating a fresh, cooking scene.

4. Steam for 10–15 minutes, depending on thickness. Serve immediately.

SHOPPING TIPS |

SALT KOJI:

Make Your Own Salt Koji at Home:

Whenever possible, I recommend making salt koji at home. With just rice koji, salt, and water, you get fresher flavor and full control over ingredient quality.

👉 How to Make Salt Koji

Pre-made salt koji is also available at Japanese grocery stores if homemade one isn't for you.

Look for:

Refrigerated product
Simple ingredients (rice koji, salt, water)
No added alcohol, preservatives, or sugar

It can be difficult to find high-quality salt koji online because it must be refrigerated to maintain proper fermentation quality. I recommend purchasing it locally when possible.

New to Seiro Steaming? Start Here:

If you're curious about which bamboo steamer (seiro) to choose, sizes, materials, and the tools I personally use, I’ve put everything together in my Seiro 101 guide. It will help you select the right setup for your kitchen.

👉 Read the Seiro 101 Guide

Also, learn more about 👉 the gut health benefits of steaming foods.

SERVING SUGGESTIONS |

Enjoy with steamed brown rice and miso soup for a balanced Japanese meal.
Add a side of pickled vegetables or a light salad for extra fiber and flavor.

FINAL THOUGHTS |

This recipe is a beautiful example of how traditional Japanese techniques and ingredients can support gut health and flavor. With just a few steps, you’ll have a nourishing, oil-free main dish perfect for any clean-eating lifestyle.