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Sauce

Spanish or Portugal Onion Sauce

A sweet and spicy onion sauce made with roasted onions, red port, powdered sugar, lemon juice, and cayenne pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Lemon and pepper match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 27,047 recipes mention both. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Spanish or Portugal Onion Sauce

Ingredients

Directions

Prepare the onions

  1. Roast the onions until they are slightly more than half done.

  2. Peel the onions.

Make the sauce

  1. Add the peeled onions to a pot with thickened gravy or coulis.

  2. Season with salt and Cayenne pepper.

  3. Add the red Port, powdered sugar, and lemon juice.

  4. Boil until the onions are tender.

  5. Mash the onions with a little butter.

Serve

  1. Serve as a sauce for your chosen dish.

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 aroma chemistry they share, and how many recipes mention both.

  1. Lemon + peppertop 3% of all pairs
    Aroma overlapstrong
    Mentioned together27,047 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Onion + peppertop 11% of all pairs
    Aroma overlapmoderate
    Mentioned together68,474 recipes

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

  3. Onion + buttertop 15% of all pairs
    Aroma overlapmoderate
    Mentioned together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

  4. Lemon + buttertop 16% of all pairs
    Aroma overlapmoderate
    Mentioned together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  5. Sugar + buttertop 17% of all pairs
    Aroma overlapmoderate
    Mentioned together98,233 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

Spanish or portugal onions
Provide the bulk and soft body of the sauce as they cook down and mash.
Red port
Adds depth, colour and a rich, fruity sweetness to the sauce.
Powdered loaf sugar
Adds sweetness that balances the acidity of the lemon and the wine.
Lemon juice
Adds acidity that brightens the sauce and cuts its richness.
Thickened gravy or coulis
Supplies the liquid base and body that the onions are simmered in.

The step that matters

Boil until the onions are tender. Onions must be fully softened for the sauce to mash smooth. Boiling too briskly can reduce the liquid too fast and scorch the bottom of the pot, so keep a gentle, steady simmer.

Flavor stand-ins for the lemon

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

  1. Lemonthe original
  2. Mangoabout as good a flavor fit

Fit is the average pairing score against onion, sugar, pepper, butter. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).

“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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