Why it works: Butter and egg match in chemistry and in kitchens. They rank in the top 8% of all ingredient pairs, and 118,511 recipes mention both. Both carry nonanal, which smells fat, citrus. The science ↓
The recipe
Ingredients
Contains: egg, milk (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Make the sauce
Remove the skin from the tomatoes and cut them into pieces in a saucepan.
Add butter, pepper, and salt; boil until sufficiently cooked.
Finish with eggs
Beat the eggs and just before serving, add them to the saucepan with the tomatoes.
Stir gently for 2 minutes until the eggs are well cooked.
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 + eggtop 8% of all pairsAroma overlapstrongMentioned together118,511 recipes
Shared aroma: nonanal (fat, citrus).
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Tomato + peppertop 4% of all pairsAroma overlapstrongMentioned together17,913 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + buttertop 11% of all pairsAroma overlapstrongMentioned together6,890 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Butter + peppertop 11% of all pairsAroma overlapstrongMentioned together85,512 recipes
Shared aroma: ethyl octanoate (fruity, wine).
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Pepper + eggtop 22% of all pairsAroma overlapmoderateMentioned together48,824 recipes
Shared aroma: 2-nonenal (fatty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Tomatoes
- Break down into a juicy sauce that gives the dish its moisture and acidity.
- Eggs
- Set when stirred into the hot tomatoes, thickening the sauce into soft, tender curds.
- Butter
- Adds richness and a silky fat that rounds out the tomato's acidity.
The step that matters
Stirring the eggs into the tomatoes. Eggs set from the heat of the sauce. Overcooking them over high heat makes them tough and grainy, so stir gently and keep the curds soft.
Flavor stand-ins for the tomato
How well each one fits the dish's main ingredients (butter, pepper, egg):
- Capsicumbetter flavor fit
- Asparagusbetter flavor fit
- Potatobetter flavor fit
- Tomatothe original
Fit is the average pairing score against butter, pepper, egg. 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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