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Sauce Robert

A French brown sauce made with onion, butter, flour, gravy, vinegar, mustard, and seasonings.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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Why it works: Onion and mustard 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 ↓

Sauce Robert

Ingredients

Directions

  1. In a saucepan, melt the butter and add the chopped onion. Cook until it takes on color.

  2. Gradually add the flour, stirring well to combine.

  3. Slowly pour in the gravy, mixing thoroughly.

  4. Season with pepper, salt, and a pinch of sugar.

  5. Strain the sauce to remove lumps, then stir in the vinegar and mustard just before serving.

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. Onion + mustardtop 6% of all pairs
    Smell alikestrong
    Cooked together9,259 recipes

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

  2. Vinegar + mustardtop 7% of all pairs
    Smell alikemoderate
    Cooked together14,067 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  3. Pepper + mustardtop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

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

  4. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

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

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

Onion
Browned onion adds sweetness and savory depth to the sauce.
Flour
Thickens the sauce as it combines with the melted butter and gravy.
Gravy
Supplies the main liquid and savory flavor of the sauce.
Vinegar
Adds acidity that brightens the rich, buttery sauce.
Mixed mustard
Adds sharpness and aroma that balance the richness of the sauce.

The step that matters

Strain and finish with vinegar and mustard. Straining removes lumps left by the flour so the sauce is smooth. Vinegar and mustard are added just before serving because prolonged heat dulls their sharp flavors and aromas.

Swap the onion

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

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

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