Why it works: Potato and onion are a kitchen classic. They rank in the top 3% of all ingredient pairs, and 9,023 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Potatoes with Tomato Sauce
Ingredients
Directions
Prepare the potatoes
Boil the potatoes in their skins.
Peel and slice the boiled potatoes.
Make the tomato sauce
Melt the butter in a saucepan.
Heat the sliced onions in the melted butter for 3 minutes.
Add the tomatoes and flour.
Cook the mixture for another 5 minutes.
Pour in the stock and boil until the tomatoes are soft.
Rub the mixture through a sieve.
Season the sieved mixture with salt.
Serve
Pour the seasoned mixture over the warm potato slices.
Boil the dish once more before serving.
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 aroma chemistry they share, and how many recipes mention both.
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Potato + oniontop 3% of all pairsAroma overlapmoderateMentioned together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Potato + tomatotop 5% of all pairsAroma overlapstrongMentioned together2,798 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + tomatotop 8% of all pairsAroma overlapmoderateMentioned together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Flour + buttertop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Potato + buttertop 13% of all pairsAroma overlapmoderateMentioned together6,456 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
Flour and butter share little aroma chemistry, yet 124,287 recipes mention both: they likely 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
- Potatoes
- Form the bulk of the dish, giving body and starchy substance to the finished plate.
- Butter
- Adds richness and carries the onions, helping them soften and take on flavour.
- Flour
- Thickens the sauce as it cooks with the tomatoes and stock.
- Tomatoes
- Provide the sauce's main flavour, acidity and moisture once softened.
- Onions
- Add savoury depth and aroma as they soften in the melted butter.
- Stock
- Supplies liquid that, boiled down with the tomatoes, forms the sauce's base.
The step that matters
Rubbing the mixture through a sieve. Pushing the cooked tomato and onion through a sieve removes skins and seeds and breaks down fibres, giving a smooth sauce; skipping or rushing this leaves a lumpy, grainy texture.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (potato, flour, butter, tomato):
- Okrabetter flavor fit
- Chivebetter flavor fit
- Capsicumabout as good a flavor fit
- Onionthe original
Fit is the average pairing score against potato, flour, butter, tomato. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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