Why it works: Lemon and pepper match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 27,047 recipes mention both. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
For the Tomato Sauce
Ingredients
Directions
Make the sauce
Melt the butter in a saucepan.
Wipe the tomatoes, remove the stalks, and slice them.
Add the sliced tomatoes and chopped onion to the pan and fry gently for 10 minutes.
Add the sugar and half of the stock.
Mix the remaining stock with the rice flour and stir into the pan.
Add the lemon juice, pepper, and salt to taste.
Let simmer gently for 30 minutes or a little longer.
Finish and serve
Rub the mixture through a fine sieve.
Reheat the sauce in a saucepan 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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Lemon + peppertop 3% of all pairsAroma overlapstrongMentioned together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Tomato + ricetop 6% of all pairsAroma overlapstrongMentioned together3,065 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Tomato + peppertop 7% of all pairsAroma overlapmoderateMentioned together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + oniontop 8% of all pairsAroma overlapmoderateMentioned together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Rice + oniontop 9% of all pairsAroma overlapmoderateMentioned together10,433 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Tomatoes
- Provide the main body, flavour and colour of the sauce.
- Butter
- Adds richness and carries flavour as the onion and tomatoes fry.
- Rice flour
- Thickens the stock so the sauce becomes smooth and coats the spoon.
- Stock
- Forms the liquid base of the sauce and adds savoury depth.
- Onion
- Adds aromatic savoury flavour as it softens in the butter.
The step that matters
Rub the mixture through a fine sieve. Pushing the cooked tomato and onion through a fine sieve removes skins, seeds and fibres, giving the sauce a smooth texture. Leaving the sauce unsieved would leave it coarse and grainy.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (tomato, butter, rice, flour, sugar, lemon, pepper):
- Capsicumbetter flavor fit
- Okrabetter flavor fit
- Asparagusbetter flavor fit
- Onionthe original
Fit is the average pairing score against tomato, butter, rice, flour, sugar, lemon, pepper. 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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