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Sauce Robert

A French sauce made with onions, butter, demi-glaze, water or broth, French mustard, and sea salt.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 stewpan, melt the butter over medium heat.

  2. Add the chopped onions and cook until they turn a nice yellow color.

  3. Stir in the demi-glaze and water or broth.

  4. Skim off any foam and bring to a quick boil.

  5. Once thickened, stir in the French mustard and season to taste.

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 + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  3. Butter + mustardtop 22% of all pairs
    Smell alikemoderate
    Cooked together8,003 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

What each ingredient does

Onions
Soften and sweeten as they cook, adding aromatic flavor to the sauce base.
Demi-glaze
Provides the concentrated meaty body and savory flavor that forms the sauce.
Butter
Cooks the onions gently and adds richness to the sauce.
French mustard
Adds sharp, tangy flavor that balances the richness of the sauce.

The step that matters

Skim off any foam and bring to a quick boil. Foam from the demi-glaze contains impurities that can make the sauce cloudy or taste bitter. Skimming before a brief boil keeps the sauce clean and lets it reduce and thicken properly.

Swap the mustard

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

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

Fit is the average pairing score against onion, butter. 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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