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 well 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 it for five hours.
After four hours, pour off the water.
Season the tripe with pepper and coarse sea salt.
Simmer the tripe
Place the tripe in a pot with equal parts milk and water.
Boil the tripe in the milk and water for one hour.
Make the sauce
In a separate saucepan, boil ten or a dozen onions until soft.
Drain and mash the onions.
Wipe out the saucepan.
Add the mashed onions with a bit of butter rolled in flour and a ⅓ cup of cream or milk. Let the mixture boil.
Serve
Add the mixture to the tripe just before serving.
Serve 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.
-
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
- The main ingredient; long simmering softens its naturally tough, chewy texture.
- Milk
- Gives the simmering liquid and the sauce a creamy, mellow body.
- Cream or milk
- Adds richness and smoothness to the sauce.
- Onions
- Softened and mashed, they add sweetness and body to the sauce.
- Butter
- Adds fat and richness, and cooks with flour to form a thickening base.
- Flour
- Thickens the sauce when cooked with butter and boiled.
The step that matters
Boiling the butter and flour into the sauce. Flour only thickens fully when it is heated in the liquid until the sauce boils. If it is not boiled, the sauce stays thin and can taste pasty or raw.
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.
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.
Tomato Soup526 recipes
Brown Bread461 recipes
Mutton Broth292 recipes
Yorkshire Pudding264 recipes