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Sauce Robert

A French sauce made with onions, butter, stock, salt, pepper, vinegar, and mustard.

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 sauce

  1. Melt a piece of butter in a pan large enough to fry the onions.

  2. Brown the onions in the butter.

  3. Dilute the browned onions with some stock, skimming occasionally.

  4. Let the sauce boil for half an hour.

Finish and serve

  1. Before serving, add coarse sea salt, black pepper, a little vinegar, and some 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. 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. Onion + vinegartop 14% of all pairs
    Smell alikemoderate
    Cooked together18,226 recipes

    Shared aroma: acetic acid (sour, vinegar).

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

What each ingredient does

Onions
Browning them builds deep, savoury flavour that forms the base of the sauce.
Butter
Fat for frying the onions, carrying flavour and helping them brown evenly.
Stock
Liquid that dilutes the browned onions and gives the sauce body as it reduces.
Vinegar
Adds acidity that brightens the rich, savoury sauce.
Mustard
Adds sharp, pungent flavour that complements the onions and vinegar.

The step that matters

Brown the onions in the butter. Browning relies on the Maillard reaction, which needs enough heat and space in the pan. Pale or steamed onions produce a flat, less complex flavour in the finished sauce.

Swap the onion

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

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

Fit is the average pairing score against butter, pepper, 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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