Why it works: Turnip and leek match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,046 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Vegetable Soup
Ingredients
Directions
Prepare
Prepare the vegetables and cut them all very small; wash and dry them.
Make the soup
Melt the dripping in a large saucepan; add the vegetables, cover, and toss over the heat until well mixed.
Pour in the water and bring to a boil without a lid; add seasonings and skim well.
Boil for 30 minutes, skimming as needed.
Cover and let simmer for 1 hour or until the vegetables are thoroughly cooked.
Serve
Place the broken bread into a hot soup tureen and pour the boiling soup over it.
Cover and serve very hot.
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.
-
Turnip + leektop 1% of all pairsSmell alikestrongCooked together1,046 recipes
Shared aroma: coumarin (sweet, hay).
-
Turnip + lettucetop 1% of all pairsSmell alikestrongCooked together526 recipes
Shared aroma: coumarin (sweet, hay).
-
Lettuce + leektop 1% of all pairsSmell alikestrongCooked together217 recipes
Shared aroma: trans-2-hexenal (green, leafy).
-
Carrot + turniptop 1% of all pairsSmell alikestrongCooked together8,002 recipes
Shared aroma: coumarin (sweet, hay).
-
Carrot + leektop 3% of all pairsSmell alikestrongCooked together1,310 recipes
Shared aroma: coumarin (sweet, hay).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Dripping
- Fat that softens the vegetables and carries flavour through the soup.
- Bread
- Soaks up the hot broth, thickening the soup and giving it body.
- Onions
- Build the base flavour, becoming sweet and savoury as they cook.
- Leeks
- Add a mild onion-like sweetness and aroma to the broth.
- Carrots
- Add sweetness and colour while softening into the broth.
The step that matters
Skimming the boiling water. Skimming removes foam and impurities that rise as the broth boils, keeping the soup clear and clean-tasting. Skimming during the first boil and the 30-minute boil is what keeps the broth clear.
Swap the onion
How well each one fits the dish's main ingredients (carrot, turnip, lettuce, leek, bread, pepper):
- Parsnipfits better
- Beetrootfits better
- Endivefits better
- Onionthe original
Fit is the average pairing score against carrot, turnip, lettuce, leek, bread, 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.
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.

Brown Bread461 recipes
Carrot Soup134 recipes
White Bread80 recipes
Bread Omelette60 recipes