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Mustard Sauce for Fish

A creamy mustard sauce for fish made with milk, mustard, corn starch, salt, cayenne, and vinegar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Mustard and vinegar are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 14,067 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Mustard Sauce for Fish

Ingredients

Directions

Make the sauce

  1. Heat the milk in a double boiler until boiling.

  2. Mix the mustard and corn starch with a little cold milk in a small bowl.

  3. Add the mustard mixture to the boiling milk, stirring well.

  4. Season with coarse sea salt and cayenne if desired.

  5. Thin the sauce with vinegar to reach the desired consistency.

Serve

  1. Pour the sauce over the fish.

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 + vinegartop 7% of all pairs
    Smell alikemoderate
    Cooked together14,067 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Milk + corntop 10% of all pairs
    Smell alikemoderate
    Cooked together6,955 recipes

    Shared aroma: hexanal (green, grassy).

  3. Mustard + corntop 12% of all pairs
    Smell alikemoderate
    Cooked together463 recipes

    Shared aroma: (e)-2-octenal (fatty, green).

  4. Milk + mustardtop 25% of all pairs
    Smell alikemoderate
    Cooked together2,658 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

  5. Corn + vinegartop 27% of all pairs
    Smell alikemoderate
    Cooked together927 recipes

    Shared aroma: 4-ethyl-2-methoxyphenol (smoky, clove).

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

What each ingredient does

Milk
Forms the liquid base that the sauce thickens into a smooth, creamy body.
Mustard
Provides the sharp, pungent flavor that defines the sauce.
Corn starch
Thickens the milk as it heats, giving the sauce body.
Vinegar
Adds acidity that brightens the rich sauce and lets you adjust its consistency.

The step that matters

Add the mustard mixture to the boiling milk, stirring well. Corn starch must be fully dispersed before it meets hot liquid, otherwise it clumps. Stirring while adding keeps the starch evenly distributed so it gelatinises smoothly and thickens the sauce evenly.

Swap the mustard

How well each one fits the dish's main ingredients (milk, corn, vinegar):

  1. Capsicumfits better
  2. Potatofits better
  3. Tomatofits better
  4. Mustardthe original

Fit is the average pairing score against milk, corn, vinegar. 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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