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Mustard Sauce

A savory sauce made with mustard, cayenne, butter, flour, curry powder, onion, stock, salt, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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Why it works: Mustard and onion match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Mustard Sauce

Ingredients

Directions

Prepare

  1. In a bowl, stir together the mixed mustard and cayenne pepper.

Make the sauce

  1. In a saucepan, melt the butter over medium heat.

  2. Add the onion and fry until browned.

  3. Stir in the flour and curry powder, cooking for one minute.

  4. Gradually add the stock, stirring to combine.

  5. Season with salt and pepper, then simmer for five minutes.

  6. Strain the sauce and serve.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Mustard + oniontop 6% of all pairs
    Smell alikestrong
    Cooked together9,259 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Mustard + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Pepper + oniontop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Mustard + flourtop 13% of all pairs
    Smell alikemoderate
    Cooked together5,066 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Butter and flour barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Mixed mustard
Provides the main sharp, pungent flavour of the sauce.
Butter
Adds fat and richness and helps cook the flour into a smooth base.
Flour
Thickens the stock into a smooth sauce when cooked with the butter.
Stock
Supplies the liquid that becomes the body of the sauce.

The step that matters

Gradually add the stock. Adding liquid slowly while stirring keeps the flour and butter mixture smooth, so lumps do not form in the sauce.

Swap the onion

How well each one fits the dish's main ingredients (mustard, pepper, butter, flour):

  1. Shallotfits better
  2. Horseradishfits better
  3. Chivefits better
  4. Onionthe original

Fit is the average pairing score against mustard, pepper, butter, flour. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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