Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Simple Oxtail Sotjp
Ingredients
Directions
Prepare the oxtail
Cut the oxtail across at each joint and trim away the fat.
Place the oxtail in a saucepan of cold water to blanch and bring to a boil.
Strain the water and wipe the joints.
Heat the butter until very hot and fry the oxtail until brown.
Make the soup
Drain the butter, then add the stock or water, onion, salt, and pepper.
Bring to a boil, skim, and simmer gently for three hours.
Strain the soup and let it cool to remove all fat.
Return the soup to the saucepan and bring to a boil.
Serve
Serve with small joints of oxtail.
Add sago or vermicelli and cook until clear.
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 + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
-
Butter + peppertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Oxtail
- Gives the soup its meaty body and rich flavour as it simmers for hours.
- Butter
- Fat used to brown the oxtail, adding colour and roasted flavour to the soup.
- Stock or water
- Forms the liquid base in which the oxtail and onion slowly release their flavour.
- Onion
- Adds savoury sweetness and aroma to the broth during simmering.
The step that matters
Skim after the first boil. Foam and fat rising at the first boil would cloud the broth and make it greasy, so skimming keeps the soup clear before its long simmer.
Swap the onion
How well each one fits the dish's main ingredients (butter, pepper):
- Capsicumfits better
- Potatofits better
- Carrotfits about as well
- Onionthe original
Fit is the average pairing score against butter, pepper. 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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