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Caper Sauce for Boiled Mutton

A buttery caper sauce made with flour, mutton cooking liquid, milk, and capers.

From an old cookbook · modernised transcription
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Why it works: Flour and capers match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 1,024 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Caper Sauce for Boiled Mutton

Ingredients

Directions

Make the sauce

  1. Melt the butter in a saucepan.

  2. Stir in the flour until thoroughly mixed.

  3. Add the mutton cooking liquid and milk, and cook until sufficiently thickened.

Finish

  1. Just before serving, stir in the capers.

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. Flour + caperstop 6% of all pairs
    Smell alikestrong
    Cooked together1,024 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

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

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Butter + caperstop 16% of all pairs
    Smell alikemoderate
    Cooked together1,637 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

Butter
Carries fat for a rich mouthfeel and helps the flour mix smoothly into a roux.
All-purpose flour
Starch thickens the sauce once heated in liquid, giving it body.
Mutton cooking liquid
Forms the savoury base of the sauce and adds meaty flavour.
Milk
Adds creaminess and softens the sauce's texture.
Capers
Add a briny, sharp acidity that cuts through the richness of the sauce.

The step that matters

Cook until sufficiently thickened. Flour starch only swells and thickens fully when heated in liquid. Stopping early leaves the sauce thin and can leave a raw, floury taste.

Swap the capers

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

  1. Cinnamonfits better
  2. Nutmegfits better
  3. Capersthe original
  4. Turmericfits about as well

Fit is the average pairing score against butter, flour, mutton, milk. 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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