Why it works: Onion and mustard match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
To Boil Tripe
Ingredients
Directions
Prepare the tripe
Wash the tripe in warm water and trim off all the fat.
Cut the tripe into small pieces.
Boil the tripe in enough water to cover it for five hours.
After four hours, pour off the water, season the tripe with pepper and coarse sea salt, and add equal parts milk and water.
Boil the tripe in the milk and water for one hour.
Make the onion sauce
Boil ten or a dozen onions until soft.
Drain the onions and mash them.
In a clean saucepan, combine the mashed onions with a bit of butter rolled in flour and a wineglass of cream or milk.
Let the mixture boil.
Serve
Add the sauce to the tripe just before serving.
Serve the tripe with pepper, vinegar, and mustard.
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 their aromas overlap, and how often cooks already put them together.
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Onion + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + creamtop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Tripe
- Is the main meat, which becomes tender through long simmering.
- Onions
- Mashed into the sauce, they give body and sweetness.
- Butter
- Enriches the sauce and adds fat for a smooth, rich mouthfeel.
- Flour
- Thickens the butter and cream sauce so it clings to the tripe.
- Milk
- Simmers with the tripe, adding moisture and a mild, creamy flavour.
The step that matters
Boiling the tripe for five hours. Tripe is tough connective tissue. Long, gentle simmering breaks down collagen so the meat becomes tender. Too short a boil leaves it chewy.
Swap the onion
How well each one fits the dish's main ingredients (pepper, milk, butter, flour, cream, vinegar, mustard):
- Horseradishfits better
- Shallotfits better
- Potatofits better
- Onionthe original
Fit is the average pairing score against pepper, milk, butter, flour, cream, vinegar, mustard. Candidates are from the same food group and used in at least 100 recipes.
“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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