Why it works: Potato and onion are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Scalloped Potatoes
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
Peel and slice the raw potatoes thinly.
Butter an earthen dish.
Layer and bake
Layer the potatoes in the dish, seasoning with salt, pepper, butter, chopped onion, and a sprinkle of flour between layers.
Continue layering until the dish is filled.
Pour 1 quart of hot milk over the top just before baking.
Bake at 350°F (175°C) for 45 minutes.
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.
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Potato + oniontop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Potato + peppertop 9% of all pairsSmell alikemoderateCooked together8,305 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Potato + milktop 9% of all pairsSmell alikemoderateCooked together3,611 recipes
Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
-
Pepper + oniontop 11% of all pairsSmell alikemoderateCooked 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
- Raw potatoes
- Form the bulk of the dish and become tender as they bake.
- All-purpose flour
- Thickens the milk into a creamy sauce around the potato slices.
- Butter
- Adds richness and helps the top and edges brown.
- Hot milk
- Forms the liquid that cooks the potatoes and becomes the sauce.
- Finely chopped onion
- Adds savory aroma and flavor that spreads through the layers.
The step that matters
Pour the milk over just before baking. Starch in the potatoes and flour needs liquid and heat to gelatinize and set the sauce. Adding the hot milk right before baking keeps the layers from sitting in liquid too long and helps the sauce thicken evenly as the dish heats.
Swap the onion
How well each one fits the dish's main ingredients (potato, butter, pepper, flour, milk):
- Chivefits better
- Capsicumfits better
- Asparagusfits better
- Onionthe original
Fit is the average pairing score against potato, butter, pepper, flour, 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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