Why it works: Sauce and ketchup match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 1,099 recipes mention both. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
The recipe
Ingredients
Contains: milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Cook the spaghetti
Cut the spaghetti into 8-inch pieces.
Cover the spaghetti with boiling water.
Add salt and cook rapidly for 15 minutes.
Drain the spaghetti and set aside.
Make the meat sauce
In a saucepan, combine meat gravy, tomato sauce, and chopped onion.
Cook for 20 minutes, then strain the sauce.
Thicken the sauce with flour and stir in ketchup or Worcestershire sauce.
Serve
Serve the spaghetti topped with the meat sauce and grated Parmesan cheese.
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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Sauce + ketchuptop 1% of all pairsAroma overlapstrongMentioned together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Tomato + parmesan cheesetop 3% of all pairsAroma overlapstrongMentioned together2,490 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Tomato + oniontop 4% of all pairsAroma overlapstrongMentioned together20,622 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + parmesan cheesetop 7% of all pairsAroma overlapmoderateMentioned together3,717 recipes
Shared aroma: guaiacol (smoky, sweet).
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Tomato + saucetop 7% of all pairsAroma overlaplowMentioned together5,468 recipes
Shared aroma: ethanol (alcoholic, ethereal).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Spaghetti
- Forms the bulk of the dish and carries the sauce.
- Meat gravy
- Adds savory, meaty flavor and body to the sauce.
- Tomato sauce
- Provides the main liquid and tangy base of the sauce.
- Flour
- Thickens the sauce so it clings to the spaghetti.
- Onion
- Adds aromatic sweetness and depth as it cooks into the sauce.
The step that matters
Thicken the sauce with flour. Flour must be cooked in the hot sauce long enough to thicken it smoothly; adding it raw or in clumps leaves lumps and a pasty taste.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (meat, tomato, sauce, flour, ketchup, parmesan cheese):
- Capsicumbetter flavor fit
- Asparagusabout as good a flavor fit
- Mustardabout as good a flavor fit
- Onionthe original
Fit is the average pairing score against meat, tomato, sauce, flour, ketchup, parmesan cheese. 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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