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Sauce Robert

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

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 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 in a frying pan over medium heat.

  2. Add the diced onions and fry them lightly until browned.

  3. Stir in the flour and cook for a minute.

  4. Add the stock, vinegar, salt, and pepper and mix well.

  5. Reduce the sauce until it thickens.

  6. Stir in the mustard 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

Onions
Browning in the butter adds savoury, caramelised flavour to the sauce base.
Flour
Thickens the sauce as it cooks with the butter and liquids.
Butter
Carries the onions and adds richness and fat to the sauce.
Vinegar
Adds acidity that brightens the sauce and balances its richness.
Mustard
Adds sharp, pungent flavour stirred in at the end.

The step that matters

Reduce the sauce until it thickens. Reducing concentrates flavour and evaporates liquid, so the sauce thickens to the right consistency. Stopping too early leaves it thin, while over-reducing can make it salty and overly intense.

Swap the onion

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

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

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