Tuna Steaks With Mustard Butter

Prep: 10 min Cuisine: American

Tender tuna steaks are marinated in a flavorful soy-ginger mixture and topped with a zesty mustard butter, making a quick, elegant dish perfect for seafood lovers.

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Ingredients

  • 2 1/4 lb. boneless tuna steaks
  • 1/8 tsp. ground ginger
  • 1 Tbsp. whipped butter, softened, divided
  • 1 Tbsp. reduced sodium soy sauce
  • 1 Tbsp. rice vinegar
  • 1/2 tsp. powdered mustard

Instructions

  1. Arrange the tuna steaks in a container large enough to hold them in a single layer.
  2. In a small bowl, combine soy sauce, rice vinegar, and ground ginger; pour over the tuna.
  3. Let stand for 5 minutes, then turn the tuna over and let stand for an additional 5 minutes.
  4. In another small bowl, mix 2 teaspoons of whipped butter with the powdered mustard until well combined.
  5. Cover and refrigerate the tuna until ready to serve.
  6. Just before serving, top the tuna with the mustard butter topping.

Tips & Substitutions

For optimal flavor, marinate the tuna steaks for at least 15 minutes, or up to an hour. If you prefer a milder taste, reduce the amount of powdered mustard in the butter. You can substitute the tuna with salmon or swordfish for a different flavor profile. Experiment with adding herbs like dill or chives to the mustard butter for extra freshness.

Serving Suggestions

Serve the tuna steaks with a side of steamed vegetables or a fresh salad for a light meal. They also pair beautifully with rice or quinoa. For a complete seafood experience, browse more American recipes like Broiled Striped Bass or Light And Creamy Scallops And Pasta to complement the flavors.

Storage & Reheating

Store any leftover tuna in an airtight container in the refrigerator for up to 2 days. To reheat, gently warm it in a skillet over low heat to avoid drying out the fish. Alternatively, you can enjoy the tuna cold, paired with a salad or in a sandwich.

Nutrition & Diet Analysis (per serving)

Each serving of Tuna Steaks With Mustard Butter contains roughly 47 calories, with 2g protein, 3g carbohydrates, and 3g fat. Note that it is relatively high in sodium, at 2047mg per serving (89% of the Daily Value).

47 kcal 2% DV
Protein Fat Carbs

Macronutrients

Protein 2.2g 4% DV
Total Fat 3.2g 4% DV
Carbs 2.8g 1% DV
Fiber 0.2g 1% DV
Sugar 0.4g 1% DV

Electrolytes

Sodium 2047mg 89% DV
Potassium 143.5mg 3% DV
Cholesterol 8.1mg 3% DV

Vitamins & Minerals

Vitamin A 25.7mcg 3% DV
Calcium 6.7mg 1% DV
Iron 0.2mg 1% DV
Diet fit Keto-friendly Under 400 cal
Contains Milk Soy Fish

Estimated from ingredients & per-serving nutrition — verify against package labels for allergies or strict diets.

* % Daily Values based on a 2,000 calorie diet (FDA 2020).

Frequently Asked Questions

Can I use frozen tuna steaks for this recipe?

Yes, you can use frozen tuna steaks, but make sure to thaw them completely in the refrigerator before marinating. This helps ensure even cooking and better flavor absorption.

What can I substitute for rice vinegar?

If you don't have rice vinegar, you can substitute it with white wine vinegar or apple cider vinegar. Each will provide a slightly different flavor, but they will still complement the tuna well.

How can I tell when the tuna is cooked properly?

Tuna is best served medium-rare, so it should be slightly pink in the center. To check, use a fork to flake the fish; it should be opaque on the outside but still tender and moist inside.

Nutrition is estimated from USDA FoodData Central ingredient data and may vary with brand, portion and preparation — see our methodology. This information is for general educational purposes only and is not medical or dietary advice (disclaimer).

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