Why it works: Ketchup and sauce 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, soy (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare the heart
Stuff the heart with forcemeat and roast it over the fire until cooked through.
Make the sauce
Slice the liver and fry the slices.
In a bowl, combine gravy, melted butter, cayenne, salt, ketchup, and soy sauce to taste.
Serve
Arrange the liver around the heart on a serving dish and pour the gravy over them.
Garnish with rolled bacon and crispy parsley.
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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Ketchup + saucetop 1% of all pairsAroma overlapstrongMentioned together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Pepper + parsleytop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Butter + parsleytop 8% of all pairsAroma overlapmoderateMentioned together28,543 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Butter + saucetop 8% of all pairsAroma overlaplowMentioned together15,317 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Liver + parsleytop 9% of all pairsAroma overlapmoderateMentioned together1,095 recipes
Shared aroma: linalool (floral, citrus).
Butter and sauce share little aroma chemistry, yet 15,317 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
- Calf's or sheep's heart
- Forms the main body of the dish, becoming firm and sliceable when cooked through.
- Calf's or sheep's liver
- Provides a rich, savoury, tender meat that contrasts with the firm heart.
- Gravy
- Adds moisture and savoury depth, coating the meats and pooling on the plate.
- Melted butter
- Adds fat and richness, giving the gravy a smoother, silkier mouthfeel.
- Rolled bacon
- Adds salty, smoky fat and browning as a garnish.
The step that matters
Roast the heart until cooked through. Heart is dense muscle, so it needs enough heat and time to cook fully; stopping early leaves it tough and unsafe, while overcooking dries it out.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (liver, butter, pepper, ketchup, sauce):
- Parsleythe original
- Celeryabout as good a flavor fit
- Sageabout as good a flavor fit
- Capersabout as good a flavor fit
Fit is the average pairing score against liver, butter, pepper, ketchup, sauce. 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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