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Boiled Onions with Cream

Onions boiled in salted water, then served with a cream sauce made from the cooking broth.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Onion and parsley are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 25,843 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓

Boiled Onions with Cream

Ingredients

Directions

Cook the onions

  1. Peel the onions and trim the roots without cutting them.

  2. Place the onions in a saucepan and cover with salted water.

  3. Add a bouquet garni and cook for 45 minutes.

Finish and serve

  1. Remove the onions and place them on a dish.

  2. Cover with cream sauce mixed with the broth from cooking.

  3. Garnish with parsley and serve hot.

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 + parsleytop 9% of all pairs
    Smell alikemoderate
    Cooked together25,843 recipes

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

  2. Onion + creamtop 18% of all pairs
    Smell alikelow
    Cooked together10,827 recipes

    Shared aroma: 2-nonanone (fruity, floral).

  3. Cream + parsleytop 29% of all pairs
    Smell alikelow
    Cooked together6,392 recipes

    Shared aroma: octanal (fat, soap).

Onion and cream barely smell alike, yet cooks put them together in 10,827 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
Provide a soft, sweet body that becomes tender during long, gentle cooking.
Cream
Adds richness and a smooth, thick texture to the sauce.
Broth from cooked onions
Carries onion flavor into the sauce and adds moisture.

The step that matters

Trim the roots without cutting them. Leaving the root end intact holds the onion layers together, so the onions stay whole during cooking instead of falling apart in the water.

Swap the parsley

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

  1. Garlicfits better
  2. Celeryfits better
  3. Nutmegfits better
  4. Parsleythe original

Fit is the average pairing score against onion, cream. 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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