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Sauce Robert

A French brown onion sauce with butter, flour, gravy, mustard, salt, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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

Make the base

  1. In a stewpan, brown the diced onions in the butter.

  2. Once they are a deep yellow brown, add the gravy and let it simmer for 15 minutes.

  3. Skim the sauce, then season with salt and pepper.

Finish

  1. Just before serving, mix in the prepared mustard.

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. Onion + beeftop 7% of all pairs
    Smell alikemoderate
    Cooked together17,092 recipes

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

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

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

  4. Beef + peppertop 10% of all pairs
    Smell alikemoderate
    Cooked together18,971 recipes

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

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

Onions
Browning in butter builds sweet, caramelised flavour that gives the sauce its body.
Butter
Fat that carries the onions' flavour and helps them brown evenly.
Beef or veal gravy
Liquid base that the browned onions simmer in to form the sauce.
Prepared mustard
Adds sharpness and a tangy edge that balances the rich, sweet onions.

The step that matters

Brown the onions to a deep yellow brown. Pale onions leave the sauce flat and underdeveloped, while over-dark onions turn bitter. Slow browning develops sweet, caramelised flavours through the Maillard reaction and caramelisation.

Swap the mustard

How well each one fits the dish's main ingredients (onion, butter, flour, beef, pepper):

  1. Potatofits better
  2. Chivefits better
  3. Leekfits better
  4. Mustardthe original

Fit is the average pairing score against onion, butter, flour, beef, pepper. 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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