Speedy Mustard Sauce

Prep: 5 min Serves: 4

A quick and creamy mustard sauce with a tangy kick, perfect for fish and easy to prepare with simple ingredients in minutes.

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Ingredients

  • 1 Tbsp chopped onion
  • 2 Tbsp margarine
  • 1 Tbsp flour
  • 1 c milk
  • 2 Tbsp Dijon mustard
  • salt

Instructions

  1. Combine chopped onion, margarine, flour, milk, and Dijon mustard in a blender or shaker.
  2. Blend or shake until well mixed.
  3. Serve the sauce over your favorite fish.

Tips & Substitutions

For a creamier texture, consider using heavy cream instead of milk. If you prefer a different flavor, swap out Dijon mustard for whole grain mustard or honey mustard for a touch of sweetness. You can also add a pinch of cayenne pepper for a spicy kick. This sauce can be made in advance, giving the flavors more time to meld together.

Serving Suggestions

This speedy mustard sauce pairs beautifully with grilled fish, such as salmon or tilapia, making it a perfect complement to your meal. Serve it alongside roasted vegetables like Southern Baked Carrots or a fresh salad for a balanced dinner. It can also work as a dipping sauce for seafood appetizers or drizzled over steamed asparagus.

Storage & Reheating

Store any leftover sauce in an airtight container in the refrigerator for up to three days. To reheat, gently warm it in a saucepan over low heat, stirring frequently until heated through. Avoid boiling, as this can alter the texture. If the sauce thickens too much, add a splash of milk to reach your desired consistency.

Nutrition & Diet Analysis (per serving)

Each serving of Speedy Mustard Sauce contains roughly 314 calories, with 5g protein, 51g carbohydrates, and 10g fat. It is an excellent source of iron (23% of the Daily Value) and calcium (20% of the Daily Value), and a good source of vitamin A and vitamin C. Note that it is relatively high in sodium, at 733mg per serving (32% of the Daily Value).

314 kcal 16% DV
Protein Fat Carbs

Macronutrients

Protein 5g 10% DV
Total Fat 10.3g 13% DV
Carbs 50.6g 18% DV
Fiber 0.7g 2% DV
Sugar 27.9g 56% DV

Electrolytes

Sodium 733.3mg 32% DV
Potassium 178mg 4% DV
Cholesterol 3.6mg 1% DV

Vitamins & Minerals

Vitamin A 152.3mcg 17% DV
Vitamin C 11.2mg 12% DV
Vitamin D 1mcg 5% DV
Calcium 257.6mg 20% DV
Iron 4.1mg 23% DV
Diet fit Under 400 cal Low-fat
Contains Milk Wheat/Gluten

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 a different type of mustard?

Absolutely! You can experiment with different types of mustard such as honey mustard for sweetness or spicy brown mustard for more heat. Each variation will provide a unique flavor profile to the sauce, allowing you to tailor it to your taste preferences.

Is it possible to make this sauce dairy-free?

Yes, you can easily make this sauce dairy-free by substituting the milk with a non-dairy alternative, such as almond milk or oat milk. Make sure to check that the margarine you use is also dairy-free to ensure the entire recipe meets your dietary needs.

How can I thicken the sauce if it's too thin?

If your sauce turns out too thin, you can thicken it by adding a bit more flour. Mix a small amount of flour with cold water to create a slurry, then stir it into the sauce while heating. Alternatively, simmering the sauce longer on low heat can also help reduce it to your desired thickness.

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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