Why it works: Tomato and onion are a kitchen classic. They rank in the top 8% of all ingredient pairs, and 20,633 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Tomato Sauce
Ingredients
Directions
Cook and strain
Boil the tomatoes in an enameled kettle for two hours.
Pass the mixture through a thin sieve or perforated nickel to achieve a thick sauce.
Bottle and process
Bottle the sauce and seal it tightly.
Process half-pint jars for 15 minutes at 222°F (106°C), pint jars for 20 minutes, and quart jars for 30 minutes.
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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Tomato + oniontop 8% of all pairsAroma overlapmoderateMentioned together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + clovetop 12% of all pairsAroma overlapmoderateMentioned together3,474 recipes
Shared aroma: ethyl caproate (fruity, apple peel).
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Clove + oniontop 13% of all pairsAroma overlapmoderateMentioned together16,901 recipes
Shared aroma: 2-nonanone (fruity, floral).
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, liquid and flavor of the sauce, which thickens as it cooks down.
- Onions
- Add savory sweetness and aromatic depth to the sauce base.
- Bay leaves
- Add a subtle herbal aroma that infuses the sauce during cooking.
- Cloves
- Add a warm, pungent spice aroma that flavors the sauce.
The step that matters
Processing the sealed jars for the full time. Heat processing for the stated minutes at the stated temperature is what destroys spoilage microbes in a low-acid sauce. Shorter times or lower temperatures can leave survivors that spoil the sauce later, so jar size and time must match.
Flavor stand-ins for the clove
How well each one fits the dish's main ingredients (tomato, onion):
- Garlicbetter flavor fit
- Cuminbetter flavor fit
- Thymebetter flavor fit
- Clovethe original
Fit is the average pairing score against tomato, onion. 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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