Why it works: Leek and onion match in chemistry and in kitchens. They rank in the top 4% of all ingredient pairs, and cooks put them together in 1,326 recipes. Both carry ethyl butyrate, which smells apple, fruity. The science ↓
Skate Soup
Ingredients
Directions
Prepare
Clean and cut the skate into pieces.
Chop the leeks, parsley, and onions.
Cook the soup
In a pot, melt butter and sauté the leeks and onions until soft.
Add the skate pieces and enough water to cover them, then bring to a boil.
Simmer until the skate is cooked through.
Thicken the soup with flour mixed in water if desired.
Stir in the milk before serving.
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.
-
Leek + oniontop 4% of all pairsSmell alikestrongCooked together1,326 recipes
Shared aroma: ethyl butyrate (apple, fruity).
-
Leek + parsleytop 4% of all pairsSmell alikestrongCooked together759 recipes
Shared aroma: trans-2-hexenal (green, leafy).
-
Leek + flourtop 8% of all pairsSmell alikestrongCooked together328 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Parsley + oniontop 9% of all pairsSmell alikemoderateCooked together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Parsley + flourtop 12% of all pairsSmell alikemoderateCooked together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Skate
- Provides the main body and flavour of the soup as it cooks through.
- Leeks
- Soften during sautéing to build a mild, sweet aromatic base.
- Onions
- Soften and sweeten during sautéing, adding depth to the soup base.
- Flour
- Thickens the cooking liquid into a smoother, more body-rich soup.
- Milk
- Adds creaminess and richness to the finished soup.
The step that matters
Thicken the soup with flour mixed in water. Flour must be mixed smoothly with water before adding, otherwise it forms lumps instead of thickening the liquid evenly as starch gelatinises with heat.
Swap the onion
How well each one fits the dish's main ingredients (leek, parsley, flour, milk):
- Shallotfits better
- Parsnipfits better
- Turnipfits better
- Onionthe original
Fit is the average pairing score against leek, parsley, flour, milk. 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.
Leek Soup31 recipes
Tomato Soup526 recipes
Brown Bread461 recipes
Mutton Broth292 recipes