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Fried Onions

Thinly sliced onions fried in butter until browned.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Fried Onions

Ingredients

Directions

Prepare

  1. Peel and thinly slice the onions.

  2. In a frying pan, melt the butter over medium heat.

  3. Add the onions and season with salt and pepper.

  4. Fry until the onions are well done and nicely browned.

Optional finish

  1. For a more delicate flavor, parboil the onions in milk before frying.

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 + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  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 + milktop 20% of all pairs
    Smell alikemoderate
    Cooked together13,418 recipes

    Shared aroma: hexanal (green, grassy).

  5. Butter + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 recipes

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

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

What each ingredient does

Onions
Main ingredient that softens and browns, turning sweet as its sugars caramelize in the pan.
Butter
Fat that carries heat evenly across the pan and adds richness and browning flavor.
Milk
Optional parboiling liquid that mellows the onions' sharp flavor before frying.

The step that matters

Frying until nicely browned. Browning needs moderate heat and enough time for sugars to caramelize. Crowding the pan or rushing traps moisture, so the onions steam instead of browning.

Swap the onion

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

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

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