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Sauce Robert

A creamy French sauce made with butter, flour, onion, stock, 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. Melt the butter or bacon in a saucepan.

  2. Add the flour and sliced onion; cook until the onion is nearly done and lightly browned.

  3. Moisten with the stock or veal jus.

  4. Season with salt, pepper, nutmeg, and sugar; stew until the onions are fully cooked.

  5. Pass the mixture through a fine sieve.

  6. Stir in the French mustard and serve hot.

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. Pepper + nutmegtop 7% of all pairs
    Smell alikestrong
    Cooked together13,015 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  3. Flour + nutmegtop 8% of all pairs
    Smell alikemoderate
    Cooked together18,623 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Nutmeg + mustardtop 8% of all pairs
    Smell alikestrong
    Cooked together1,019 recipes

    Shared aroma: methyleugenol (clove, spice).

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

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

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

What each ingredient does

Flour
Thickens the stock into a sauce as it cooks with the fat.
Butter or bacon
Provides the fat that cooks the onion and carries flavour into the sauce.
Onion
Sweetens and deepens the sauce as it browns and softens.
Stock or veal jus
Supplies the liquid base that gives the sauce its body and savoury flavour.
French mustard
Adds sharp, tangy flavour that balances the richness of the sauce.

The step that matters

Cook the onion until lightly browned before adding liquid. Browning the onion and flour builds deeper flavour through the Maillard reaction, and cooking out the flour's raw taste keeps the sauce from tasting pasty. Adding stock too early leaves these flavours undeveloped.

Swap the onion

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

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

Fit is the average pairing score against butter, flour, veal, pepper, nutmeg, sugar, 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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