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.
Trim off all the fat from the tripe.
Cut the tripe into small pieces.
Boil the tripe in enough water to cover for five hours.
After four hours, pour off the water.
Season the tripe with salt and pepper.
Add equal parts milk and water to the tripe.
Boil the tripe for one hour in the milk and water mixture.
Make the onion sauce
Boil ten or a dozen onions until soft.
Drain and mash the onions.
In a clean saucepan, melt a bit of butter.
Roll the butter in flour.
Add the mashed onions to the butter-flour mixture.
Add a splash of cream or milk to the mixture and let the mixture boil.
Serve
Add the mixture 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).
-
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
- Main ingredient that becomes tender and gives the soup its chewy, meaty body after long boiling.
- Onions
- Softened and mashed, they add sweetness and a thick, savoury body to the sauce.
- Butter
- Fat that carries the flour and gives the sauce a rich, smooth base.
- Flour
- Cooked with butter, it thickens the sauce by absorbing liquid as it heats.
- Milk
- Adds creaminess and mild sweetness, softening the tripe's flavour and texture.
The step that matters
Boil the tripe for five hours. Tripe is tough connective tissue. Long, gentle boiling breaks it down slowly, so cutting the time short 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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