Why it works: Onion and potato are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Beef Soup
Ingredients
Directions
Make the broth
In a large pot, boil the hock of beef for 4-5 hours.
Once the scum has been removed, add the whole onions.
Finish the soup
When the soup is nearly done, cut the meat from the bone into small pieces and return to the pot.
Season with salt, pepper, and sweet herbs.
Add the sliced carrots and potatoes.
For dumplings, mix part potato with flour, shape them small, and boil for 15-20 minutes.
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 + potatotop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Carrot + potatotop 4% of all pairsSmell alikestrongCooked together3,107 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
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Pepper + carrottop 6% of all pairsSmell alikestrongCooked together14,555 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + carrottop 6% of all pairsSmell alikemoderateCooked together21,601 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Beef + oniontop 7% of all pairsSmell alikemoderateCooked together17,092 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
- Hock of beef
- Long simmering releases flavour and gelatin into the broth, giving the soup body.
- Whole onions
- Release sweetness and aromatic depth into the broth as they cook.
- Carrots
- Add natural sweetness and a firm texture that holds up during simmering.
- Potatoes
- Soften as they cook, thickening the broth slightly and adding starchy body.
The step that matters
Removing the scum. Scum is coagulated protein and impurities that rise during boiling. Skimming it early keeps the broth clear and free of bitter, off-flavours.
Swap the onion
How well each one fits the dish's main ingredients (beef, pepper, carrot, potato):
- Capsicumfits about as well
- Tomatofits about as well
- Onionthe original
- Parsnipfits about as well
Fit is the average pairing score against beef, pepper, carrot, potato. 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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