Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and 27,232 recipes mention both. Both carry delta-decalactone, which smells sweet, creamy. The science ↓
Tomato Sauce
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.
Make the sauce
Fry the minced onion in the butter until soft.
Add the flour and cook for a minute.
Stir in the strained tomatoes until smooth.
Season with salt and cayenne to taste.
Bake and serve
Pour the sauce over fish or macaroni.
Cover the sauce with bread crumbs.
Drizzle the sauce with melted butter.
Bake at 350°F (175°C) until hot and crumbs are browned.
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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Butter + breadtop 7% of all pairsAroma overlapmoderateMentioned together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Onion + tomatotop 8% of all pairsAroma overlapmoderateMentioned together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Tomato + breadtop 10% of all pairsAroma overlapmoderateMentioned together1,013 recipes
Shared aroma: 2-nonenal (fatty, green).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Onion + buttertop 15% of all pairsAroma overlapmoderateMentioned together42,912 recipes
Shared aroma: decanal (soap, orange peel).
Butter and flour 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
- Butter
- Fat that softens the onion and carries flavor, and melted butter adds richness and browning on top.
- Flour
- Thickens the tomatoes into a smooth sauce as it cooks briefly with the butter.
- Strained tomatoes
- Form the base of the sauce, providing moisture, acidity and body.
- Bread crumbs
- Form a crisp, browned topping when baked over the sauce.
The step that matters
Stir in the strained tomatoes until smooth. Adding tomatoes to a flour and butter base without stirring well can leave lumps of flour. Stirring until smooth lets the flour disperse evenly so the sauce thickens uniformly.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (butter, flour, tomato, bread):
- Capsicumbetter flavor fit
- Shallotbetter flavor fit
- Eggplantbetter flavor fit
- Onionthe original
Fit is the average pairing score against butter, flour, tomato, bread. 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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