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 ↓
Tomato Sauce, No. 1
Ingredients
Directions
Prepare
Melt the butter in a saucepan.
Wipe the tomatoes, remove the stalks, and slice them.
Add the sliced tomatoes and chopped onion to the saucepan.
Make the sauce
Fry gently for ten 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 thirty 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).
-
Tomato + ricetop 6% of all pairsAroma overlapstrongMentioned together3,065 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
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 acidity of the sauce.
- Butter
- Adds fat and richness, carrying flavour through the sauce.
- Rice flour
- Thickens the stock and tomatoes into a smooth, body-rich sauce.
- Stock
- Supplies the liquid base and savoury depth of the sauce.
- Chopped onion
- Adds savoury aroma as it softens in the butter.
The step that matters
Stirring the rice flour into the stock. Flour added to hot liquid can clump if not stirred in well. Mixing it with the stock first and then stirring into the pan helps it disperse evenly, giving a smooth, thickened sauce rather than lumps.
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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