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Sauce Robert

A savory sauce made with onion, butter, flour, stock, vinegar, mustard, and anchovy paste.

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

  1. In a saucepan, brown the sliced onion in the butter.

  2. Stir in the brown flour to create a roux.

  3. Gradually add the stock while stirring until it boils.

  4. Mix the vinegar, mustard, and anchovy paste in a bowl, then add to the sauce. Stir well to combine all ingredients.

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. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + mustardtop 13% of all pairs
    Smell alikemoderate
    Cooked together5,066 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Butter + anchovytop 13% of all pairs
    Smell alikemoderate
    Cooked together3,697 recipes

    Shared aroma: decanal (soap, orange peel).

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

Brown flour
Thickens the sauce by forming a roux with the butter.
Butter
Carries the onion's flavour and helps form the roux with the flour.
Stock
Forms the liquid base that the roux thickens into a sauce.
Onion
Adds sweetness and savoury depth as it browns in the butter.

The step that matters

Adding the stock gradually while stirring. Adding liquid slowly while stirring keeps the roux smooth, so flour doesn't clump into lumps that are hard to remove once the sauce boils.

Swap the onion

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

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

Fit is the average pairing score against butter, flour, vinegar, mustard, anchovy. 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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