Why it works: Carrot and parsley match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 8,053 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓
Vegetable Soup
Ingredients
Directions
Make the soup
Combine beef stock, carrots, turnips, onions, parsley, tomatoes, and potatoes in a large pot.
Add clear water and bring to a boil.
Cook for 1 hour.
Remove the parsley and strain the vegetables through a sieve.
Return the strained mixture to the pot, add milk, salt, and cayenne pepper.
Boil for an additional 20 minutes.
Serve
Serve over fried toast cut into dice in a heated tureen.
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.
-
Carrot + parsleytop 1% of all pairsSmell alikestrongCooked together8,053 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Carrot + turniptop 1% of all pairsSmell alikestrongCooked together8,002 recipes
Shared aroma: coumarin (sweet, hay).
-
Turnip + parsleytop 2% of all pairsSmell alikestrongCooked together2,842 recipes
Shared aroma: coumarin (sweet, hay).
-
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).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Potatoes
- Break down during simmering to give the strained soup body and thickness.
- Milk
- Adds richness and a creamy, mellow texture to the finished soup.
- Beef stock
- Provides the savory meaty base that carries the flavour of the soup.
- Onions
- Contribute sweetness and aromatic depth as they soften in the broth.
- Tomatoes
- Add acidity and fruity brightness that balances the sweet root vegetables.
The step that matters
Strain the vegetables through a sieve. Pressing the cooked vegetables through a sieve breaks them into a smooth purée that thickens the broth. Skipping or rushing this leaves the soup thin and chunky.
Swap the tomato
How well each one fits the dish's main ingredients (beef, carrot, turnip, onion, parsley, milk, potato):
- Leekfits better
- Parsnipfits better
- Chivefits better
- Tomatothe original
Fit is the average pairing score against beef, carrot, turnip, onion, parsley, milk, 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.
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.

Tomato Soup526 recipes
Potato Croquettes255 recipes
Roast Beef211 recipes
Beef Loaf175 recipes