Why it works: Milk and butter are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Mock Oyster Soup
Ingredients
Directions
Prepare the roots
Scrape the oyster-plant or salsify roots.
Place the roots in cold water to prevent discoloration.
Slice the roots thinly.
Cover the sliced roots with boiling water.
Cook
Add the salt codfish or mackerel.
Cover the pot.
Cook for 1 hour.
Remove the fish.
Finish and serve
Add the milk.
Add the salt.
Add the black pepper.
Add the butter.
Pour the soup into a tureen.
Serve with oyster crackers.
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.
-
Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Oyster + buttertop 12% of all pairsSmell alikemoderateCooked together8,184 recipes
Shared aroma: 2,6-nonadienal (cucumber, green).
-
Oyster + milktop 20% of all pairsSmell alikemoderateCooked together2,933 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Pepper + buttertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
Milk + peppertop 22% of all pairsSmell alikemoderateCooked together26,984 recipes
Shared aroma: ethyl 2-methylbutyrate (fruity, apple).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Oyster-plant or salsify roots
- Provide the main body and the mild, oyster-like flavour of the soup.
- Salt codfish or mackerel
- Adds savoury, salty flavour to the cooking water that seasons the soup.
- Milk
- Makes the soup creamy and mellows its flavour.
- Butter
- Adds richness and a silky mouthfeel to the finished soup.
The step that matters
Place the roots in cold water. Cut oyster-plant or salsify discolours quickly when exposed to air, turning grey and dulling the soup. Holding the slices in cold water slows this browning until they are cooked.
“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.

Corn Fritters6 recipes
Tomato Soup526 recipes
Brown Bread461 recipes
Mutton Broth292 recipes