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 ↓
Vegetable Soup
Ingredients
Directions
Make the broth
In a large pot, combine the beef soup bone and boiling water.
Boil for at least 4 hours.
Add the vegetables
One hour before the soup is done, add the chopped carrot, onions, cabbage, potatoes, and rice.
Do not add salt until the meat is tender.
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.
Photo for illustrative purposes only · Contact us to use it
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 + potatotop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Carrot + potatotop 4% of all pairsSmell alikestrongCooked together3,107 recipes
Shared aroma: 2-isobutyl-3-methoxypyrazine (green bell pepper, earthy).
-
Carrot + oniontop 6% of all pairsSmell alikemoderateCooked together21,601 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Potato + ricetop 7% of all pairsSmell alikestrongCooked together851 recipes
Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).
-
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
- Beef soup bone
- Releases meaty flavor and gelatin into the broth during long simmering.
- Potatoes
- Soften and thicken the broth slightly as their starch releases during cooking.
- Rice
- Absorbs liquid and adds body as it cooks in the soup.
The step that matters
Do not add salt until the meat is tender. Salt drawn in early can toughen meat fibers as they cook, and the broth reduces during long simmering, so seasoning too early can leave the soup over-salted. Waiting lets you season the finished broth accurately.
Swap the cabbage
How well each one fits the dish's main ingredients (beef, carrot, onion, potato, rice):
- Leekfits better
- Tomatofits better
- Chivefits better
- Cabbagethe original
Fit is the average pairing score against beef, carrot, onion, potato, rice. 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.
More vegetable soup recipes
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.

Potato Croquettes255 recipes
Roast Beef211 recipes
Beef Loaf175 recipes
Carrot Soup134 recipes