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Sauce

Mustard Sauce

A simple sauce made with mustard, flour, butter, salt, lemon juice, and boiling water.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Mustard and lemon match in chemistry and in kitchens. They rank in the top 11% of all ingredient pairs, and cooks put them together in 3,816 recipes. Both carry eucalyptol, which smells eucalyptus, herbal. The science ↓

Mustard Sauce

Ingredients

Directions

  1. Make a paste with the mustard, flour, salt, and butter.

  2. Put this mixture in a small saucepan.

  3. Pour the boiling water over the mixture and boil for a few minutes.

  4. Add the lemon juice and stir well.

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 + lemontop 11% of all pairs
    Smell alikestrong
    Cooked together3,816 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  2. Flour + buttertop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: isobutyraldehyde (malty, green).

  4. Lemon + buttertop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  5. Lemon + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Flour and butter 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

Flour
Thickens the sauce as it cooks, giving it body.
Butter
Adds richness and smooth mouthfeel to the sauce.
Raw mustard
Provides the sharp, pungent flavor that defines the sauce.
Lemon juice
Adds acidity that brightens and balances the rich, sharp flavors.

The step that matters

Pour the boiling water over the mixture and boil for a few minutes. Flour must be fully heated in liquid to gelatinize its starch. Boiling for a few minutes thickens the sauce and cooks out raw flour taste; undercooking leaves it pasty.

Swap the lemon

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

  1. Raisinfits better
  2. Avocadofits better
  3. Coconutfits better
  4. Lemonthe original

Fit is the average pairing score against mustard, flour, butter. 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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