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If you have butter, soy sauce, and spaghetti in your pantry, you can make this mouthwatering Japanese pasta.

Butter Shoyu Pasta with Japanese Mushrooms

If you have butter, soy sauce, and spaghetti in your pantry, you can make this mouthwatering Japanese-style pasta with a medley of mushrooms. Butter Soy Sauce Pasta is ridiculously flavorful for the small amount of effort, so this weeknight pasta is sure to become a favorite.
Course Entree
Cuisine Best, Japanese
Keyword easy, pasta, quick
Level Beginner
Main Ingredient Mushrooms, Pasta
Diet Low Sugar, Pescatarian, Vegetarian
Prep Time 2 minutes
Cook Time 8 minutes
Total Time 10 minutes
Servings 2 servings
Calories 632kcal


  • 300 grams mushrooms (I used equal parts shimeji, maitake, and shiitake)
  • 225 grams spaghetti
  • 1 tablespoon olive oil
  • 12 grams garlic (2 large cloves, chopped)
  • 2 tablespoons soy sauce
  • 28 grams cultured unsalted butter (2 tablespoons)
  • Flat-leaf parsley (chopped for garnish)


  • Bring a wide pan filled with 2-inches of water to a boil and salt generously (I usually add 1 tablespoon per gallon of water).
  • Trim the mushrooms and slice or shred them into bite-sized pieces.
  • Boil the pasta for 1 minute less than what the package directions say.
    Boiling spaghetti for butter soy sauce pasta.
  • In a separate frying pan over medium heat, add the olive oil and garlic. Saute the garlic until it is fragrant and starting to soften, but do not let it brown yet.
    Sautéing garlic in a frying pan for pasta.
  • Add the mushrooms and saute until they're wilted and starting to brown. Depending on your mushrooms, you may need to add a little more olive oil to ensure they brown evenly.
    Stir-frying mixed Japanese mushrooms.
  • When the pasta is almost done, and the mushrooms have browned, melt the butter into the mushrooms.
    Adding butter to fried mushrooms.
  • Add the soy sauce and a scoop of the starchy pasta water. Mix this vigorously to emulsify the butter with the liquids.
    Adding soy sauce to butter and mushrooms.
  • Transfer the pasta to the pan with the mushrooms using tongs or a slotted spoon and toss to coat evenly with the sauce. Continue adding the pasta water as it gets absorbed until the pasta is cooked to your liking and is coated in a thin layer of the creamy sauce.
    Tossing mushrooms, butter and soy sauce with pasta.
  • Garnish with parsley and serve immediately.
    Garnishing Butter Shoyu Pasta with Parsley



Calories: 632kcal | Carbohydrates: 92g | Protein: 22g | Fat: 21g | Saturated Fat: 9g | Cholesterol: 30mg | Sodium: 1121mg | Potassium: 790mg | Fiber: 5g | Sugar: 6g | Vitamin A: 350IU | Vitamin C: 5mg | Calcium: 34mg | Iron: 3mg