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Onion Pie

Onion pie is a savory pie made with sliced onions, butter, flour, eggs, and a pie crust.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Onion Pie

Ingredients

Directions

Make the filling

  1. Slice onions and simmer until tender.

  2. Add butter and flour and season to taste.

  3. Beat eggs and mix everything together.

Bake

  1. Pour mixture into pie crust and bake until set.

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

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

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

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: decanal (soap, orange peel).

  4. Flour + eggtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Butter + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 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

Onions
Provide the main filling bulk, moisture, and mild sweetness as they soften.
Butter
Adds fat for richness and a smooth, rounded flavor.
Flour
Thickens the mixture so it holds together rather than running.
Eggs
Set when heated, binding the filling into a sliceable custard.

The step that matters

Bake until set, not longer. Egg proteins coagulate as they heat and then tighten further. Overbaking squeezes out liquid and makes the filling rubbery and grainy, so remove the pie once the center barely wobbles.

Swap the onion

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

  1. Chivefits better
  2. Shallotfits better
  3. Asparagusfits better
  4. Onionthe original

Fit is the average pairing score against butter, flour, egg, 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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