Why it works: Lettuce and endive match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 284 recipes. Both carry trans-2-hexenal, which smells green, leafy. The science ↓
Spring Vegetable Soup
Ingredients
Directions
Make the broth
In a large pot, stew the knuckle of veal in cold water with salt, carrot, turnips, and onion for three hours over low heat.
Skim off any scum that forms at the beginning and end of cooking.
After one hour, add the chopped lettuce hearts, celery, endive, white onion, cucumber, and asparagus.
Season with white pepper.
Serve
Serve the meat with some of the vegetables, melted butter, chopped parsley, and optional bacon or pickled pork.
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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Lettuce + endivetop 1% of all pairsSmell alikestrongCooked together284 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Lettuce + cucumbertop 1% of all pairsSmell alikestrongCooked together1,409 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Turnip + endivetop 1% of all pairsSmell alikestrongCooked together65 recipes
Shared aroma: coumarin (sweet, hay).
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Carrot + celerytop 1% of all pairsSmell alikestrongCooked together10,173 recipes
Shared aroma: myristicin (spice, warm).
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Turnip + lettucetop 1% of all pairsSmell alikestrongCooked together526 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
- Knuckle of veal
- Long stewing breaks down connective tissue, giving the broth body and flavor and making the meat tender.
- Lettuce hearts
- Added late so they soften while keeping a fresh, tender texture and mild sweetness.
- Asparagus
- Added late so it cooks through while staying tender-crisp and bright in color.
- Melted butter
- Adds richness and fat, rounding out the lean broth and vegetables.
The step that matters
Skimming the scum. Scum that forms at the start and end of cooking contains impurities and proteins that can cloud the broth and taint its flavor if left in. Removing it keeps the soup clear and clean-tasting.
Swap the onion
How well each one fits the dish's main ingredients (veal, carrot, turnip, lettuce, celery, endive, cucumber):
- Beetrootfits better
- Leekfits better
- Parsnipfits better
- Onionthe original
Fit is the average pairing score against veal, carrot, turnip, lettuce, celery, endive, cucumber. 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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