Why it works: Onion and pepper are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Mock Turtle Soup
Ingredients
Directions
Prepare the head
Scrape and scald the calf's head, then crack it open and remove the brains.
Soak the head in salted water overnight.
Boil the head in 2 gallons of water until the bones can be removed.
Cut the head and tongue into small pieces.
Make the soup
Prepare 1½ dozen force balls made of veal, browned in butter.
Add 2 tablespoons of browned flour, 2 chopped onions, a little mace, pepper, and salt to the soup.
Strain the soup, then bring it to a boil, adding the brains and force balls.
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.
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Mace + peppertop 16% of all pairsSmell alikelowCooked together12,257 recipes
Shared aroma: myristicin (spice, warm).
-
Onion + macetop 17% of all pairsSmell alikelowCooked together7,078 recipes
Shared aroma: eugenol (clove, spicy).
-
Veal + oniontop 17% of all pairsSmell alikelowCooked together6,841 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Flour + oniontop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Mace and pepper barely smell alike, yet cooks put them together in 12,257 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Calf's head
- Provides the gelatinous meat and bones that give the soup body and richness.
- Veal force balls
- Add savory meaty bulk and texture to the finished soup.
- Browned flour
- Thickens the soup and adds a toasted, nutty color and flavor.
- Onions
- Contribute savory sweetness and aromatic depth as they cook into the broth.
Swap the mace
How well each one fits the dish's main ingredients (veal, flour, onion, pepper):
- Turmericfits better
- Parsleyfits better
- Garlicfits better
- Macethe original
Fit is the average pairing score against veal, flour, onion, 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.
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.
Veal Patties50 recipes
Beef, Mutton, or Veal Broth6 recipes
Tomato Soup526 recipes
Brown Bread461 recipes