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Onion Soup, Garbure

Layered onion gratin with toasted bread, baked until golden.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓

Onion Soup, Garbure

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare the onions

  1. Cut the ends off the onions, peel, and slice them into ⅛‑inch thick pieces.

  2. In a flat saucepan, heat the clarified butter and fry the onions until light brown.

Layer and bake

  1. In a deep baking dish, layer toasted bread and onions, seasoning with salt and pepper.

  2. Continue layering until the dish is full, finishing with a layer of onions.

  3. Moisten the layers with broth and place in the oven to gratinate at 350°F (175°C).

Serve

  1. Serve with a soup tureen of good beef broth.

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. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

  2. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

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

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

    Shared aroma: decanal (soap, orange peel).

  4. Onion + breadtop 15% of all pairs
    Smell alikemoderate
    Cooked together8,676 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  5. Bread + peppertop 16% of all pairs
    Smell alikemoderate
    Cooked together20,964 recipes

    Shared aroma: 2-nonenal (fatty, green).

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

What each ingredient does

White onions
Provide the bulk and sweetness as they caramelise into the soup base.
Clarified butter
Fries the onions to golden browning while adding rich fat flavour.
Toasted bread
Absorbs broth and holds the layers together, giving the dish body.
Broth
Moistens the layers so the bread softens and the dish becomes soupy.

The step that matters

Frying the onions until light brown. Slow browning develops sweetness and depth through the Maillard reaction and caramelisation. Pale or burnt onions will make the soup taste flat or bitter.

Swap the onion

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

  1. Capsicumfits better
  2. Tomatofits better
  3. Potatofits about as well
  4. Onionthe original

Fit is the average pairing score against butter, bread, pepper. 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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