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Scalloped Onions

Scalloped onions are baked onions layered with bread crumbs, butter, salt, pepper, and milk.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Scalloped Onions

Why it works: Bread and butter 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 ↓

Scalloped Onions

Oven, in the book's wordsA hot oven

Ingredients

Directions

The book says “a hot oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.

Prepare

  1. Preheat the oven to 400°F (200°C).

Assemble the dish

  1. In a shallow baking dish, layer grated stale bread crumbs.

  2. Add a layer of thinly sliced raw onions.

  3. Dot with bits of butter and sprinkle with pepper and salt.

  4. Repeat layers until the dish is full, finishing with a layer of crumbs mixed with melted butter.

  5. Pour sweet milk over the top (about 1 cup for a quart dish).

  6. Add cream if desired.

Bake

  1. Bake for 45 minutes to 1 hour, until the onions are well cooked.

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.

Photo for illustrative purposes only · Contact us to use it

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. Bread + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

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

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

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

  3. Butter + creamtop 8% of all pairs
    Smell alikemoderate
    Cooked together41,516 recipes

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

  4. Bread + milktop 11% of all pairs
    Smell alikemoderate
    Cooked together11,466 recipes

    Shared aroma: 2-undecenal (sweet).

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

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

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

What each ingredient does

Stale bread
Forms the crumb layers that soak up milk and hold the dish's structure while baking.
Raw onions
Soften and turn sweet as they cook, providing the main flavour and bulk.
Butter
Adds richness and helps the top crumbs brown in the oven.
Sweet milk
Moistens the bread and sets into a custard-like binder around the onions.

The step that matters

Bake until the onions are well cooked. Raw onion slices stay firm and sharp if underbaked. Milk and heat need time to soften the onions fully and set the liquid, so check that the onion pieces are tender through before serving.

Swap the onion

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

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

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