Shio Koji Salmon (Easy Japanese Marinated Salmon Recipe)

Elevate your salmon dinner with umami with this Shio Koji Salmon recipe! Fresh salmon is marinated in shio koji to tenderize and enhance its natural flavor. This simple Japanese dish has deep, fermented umami and only needs 2 ingredients.

It's an easy way to make everyday salmon so flavorful with minimal ingredients, and it works beautifully for both weeknight meals and a simple Japanese-style teishoku.

If you are new to koji fermentation, start with my Japanese Koji Fermentation Guide post. If you love shio koji, also try the Shio Koji Chicken recipe!

What is Shio Koji Salmon

Shio koji salmon is a simple Japanese dish made by marinating salmon in shio koji, a traditional Japanese fermented seasoning made from rice koji, salt, and water.

The natural enzymes in shio koji gently break down the proteins in the fish, making the salmon more tender. Shio koji also enhances the natural flavor of the food, while developing a subtle, fermented umami flavor.

It's a staple technique in Japanese home cooking. Quietly powerful but incredibly simple to make.

Ingredients

• Salmon fillets: Use 5-6oz fillet per serving.
• Shio koji: Making homemade shio koji is so easy! It takes 1-2 weeks to ferment shio koji. If you want to kick-start cooking right away, you can get one on Amazon or at Asian grocery stores.

How to Make Shio Koji Salmon (Step-by-Step)

1. Pat the salmon dry with a paper towel. Coat salmon evenly with shio koji and let it marinate in the fridge for 30 minutes up to 12 hours.

You can also marinate in a resealable bag, which is mess-free and great for storing in the fridge or freezer for meal prep.

3. Transfer the marinated salmon to the prepared baking sheet. Bake for 15-17 minutes until cooked through, and the thickest part reaches an internal temperature of 145°F.

Variatons

You can add aromatics and herbs to the marinade to make this salmon recipe even more flavorful! Add one or a combination of ideas below to make this recipe your own.

• Grated garlic
• Grated or minced ginger
• Lemon juice or lemon slices
• Mirin
• Jalapeno slices
• Crushed red pepper
• Scallions
• Red onion
• Oregano
• Basil

How Long to Marinate Salmon in Shio Koji

Shio koji marinated salmon is ready in as fast as 30 minutes! You can also prepare the night before to deepen the flavor.

• 30-60 minutes: just enough for tendelizing and lightly seasoning the food.
• Overnight: great for deep umami flavor to develop.

I don't recommend marinating for more than 1-2 days. Shio koji is powerful, and it can break down the salmon too much.

Always keep the marinated salmon in the fridge.

What Shio Koji Does to Salmon?

Shio koji works differently from regular marinades. It doesn't just season the fish, but reacts with the ingredients to enhance their natural flavor.

The enzymes in shio koji gently break down protein, which can make the salmon more tender. This process also releases amino acids, contributing to a deeper umami taste.

It's a subtle transformation, but you'll notice it in each bite.

What to Serve with Shio Koji Salmon

This umami salmon dish makes part of a Japanese-style meal beautifully, or you can make a simple salmon bowl with rice and sliced cucumbers.

If you're making a Japanese teishoku-style meal, use the Ichiju Sansai principle: compose a meal with rice, soup, main dish, and two sides. Here are fun options:

• Rice: white or brown rice for the base of the meal.
• Soup: Kabocha Squash Miso Soup and Shio Koji Tomato Soup.
• Main dish: shio koji salmon, Shio Koji Chicken, tamagoyaki (Japanese rolled egg omelette).
• Side Dish: Japanese Cucumber Salad (Sunomono) and Cold Soba Noodle Salad.
• Adding desserts like Hanami Dango, Mitarashi Dango, and Shiratama Dango is also fun!

Storage

Store cooked salmon in an airtight container for up to 2-3 days. Gently reheat and enjoy!

You can also freeze marinated (uncooked) salmon for meal prep.

FAQ

Shio Koji Salmon

Elevate your salmon dinner with umami with this Shio Koji Salmon recipe! Fresh salmon is marinated in shio koji to tenderize and enhance its natural flavor. This simple Japanese dish has deep, fermented umami and only needs 2 ingredients.

Print Recipe Pin Recipe

Prep Time 5 minutes mins

Cook Time 15 minutes mins

Total Time 20 minutes mins

Course Main Course

Cuisine Japanese

Servings 2 servings

Calories 537 kcal

Ingredients

  

1x2x3x

• 2 salmon fillets 5-6oz each
• 2 tablespoons shio koji

Instructions

 

• Pat the salmon dry with a paper towel. Coat salmon evenly with shio koji and let it marinate in the fridge for 30 minutes up to 12 hours. You can marinate in a resealable bag, which is great for storing in the fridge or freezer for meal prep.
• Preheat the oven to 400°F. Line a baking sheet with parchment paper.
• Transfer the marinated salmon to the prepared baking sheet. Bake for 15-17 minutes until cooked through, and the thickest part reaches an internal temperature of 145°F.

Notes

Please note that the nutritional information provided is just an estimate, and accuracy is not guaranteed.

Variations:

You can add aromatics and herbs to the marinade to make this salmon recipe even flavorful! Add one or combination of ideas below to make this recipe your own.

• Grated garlic
• Grated or minced ginger
• Lemon juice or lemon slices
• Mirin
• Jalapeno slices
• Crushed red pepper
• Scallions
• Red onion
• Oregano
• Basil

Nutrition

Serving: 1servingCalories: 537kcalCarbohydrates: 12gProtein: 69gFat: 22gSaturated Fat: 3gPolyunsaturated Fat: 9gMonounsaturated Fat: 7gCholesterol: 187mgSodium: 150mgPotassium: 1666mgVitamin A: 136IUCalcium: 41mgIron: 3mg

Keyword Healthy Meal, koji, salmon, shio koji

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