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Common Mustard

A condiment made by mixing mustard flour with water and salt.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Mustard and flour are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 5,066 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Common Mustard

Ingredients

Directions

Prepare

  1. Place mustard flour in a plate.

  2. Add salt and gradually mix in boiling water until smooth.

  3. Rub with a broad-bladed knife or wooden spoon until perfectly smooth.

Milder variation

  1. For a milder mustard, substitute sugar for salt and use boiling milk instead of water.

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

    Shared aroma: isobutyraldehyde (malty, green).

  2. Flour + sugartop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  3. Mustard + sugartop 19% of all pairs
    Smell alikemoderate
    Cooked together8,424 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

What each ingredient does

Mustard flour
Provides the sharp mustard flavour and the bulk of the paste.
Boiling water
Hydrates the mustard flour so it forms a smooth, spreadable paste.

The step that matters

Rub until perfectly smooth. Mustard flour needs thorough hydration and working to become a smooth paste; lumps left behind stay dry and gritty, and the heat of boiling water helps the flour's pungent compounds develop as it sits.

Swap the mustard

The recipe marks mustard as optional. How well each one fits the dish's main ingredients (flour, sugar):

  1. Arrowrootfits better
  2. Beetrootfits better
  3. Sweet potatofits better
  4. Mustardthe original

Fit is the average pairing score against flour, sugar. 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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