Name: Smelts Sur Le Plat
Ingredients: 6 smelts; a pinch of salt; a pinch of pepper; flour for coating; 1 small onion, chopped fine; 3 tablespoons fish stock; a dash of lemon juice; 1 egg-sized piece of butter

Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Smelts Sur Le Plat

Ingredients

Directions

Prepare

Clean and wash the smelts carefully.
Season with salt and pepper, then roll in flour.

Cook

Add the chopped onion, fish stock, lemon juice, and butter to the smelts.
Place everything in a bag and cook for 15 minutes.

Recipe from a historical cookbook (Internet Archive).

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.

Pepper + lemontop 3% of all pairs

Smell alikestrong

Cooked together27,047 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Pepper + oniontop 11% of all pairs

Smell alikemoderate

Cooked together68,474 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Fish + buttertop 12% of all pairs

Smell alikemoderate

Cooked together4,488 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Flour + buttertop 12% of all pairs

Smell alikelow

Cooked together124,287 recipes

Shared aroma: isobutyraldehyde (malty, green).
Onion + buttertop 15% of all pairs

Smell alikemoderate

Cooked together42,912 recipes

Shared aroma: decanal (soap, orange peel).

Flour and butter barely smell alike, yet cooks put them together in 124,287 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

Smelts: Form the main body of the dish, cooking into tender, flaky flesh.
Flour: Coats the fish, helping it brown and giving a light crust.
Butter: Adds fat for richness and helps carry flavour through the fish.
Fish stock: Provides moisture so the fish steams gently inside the bag.
Onion: Adds aroma and mild sweetness as it softens during cooking.

Swap the onion

How well each one fits the dish's main ingredients (smelt, pepper, flour, fish, lemon, egg, butter):

Asparagusfits better
Spinachfits better
Shallotfits better
Onionthe original

Fit is the average pairing score against smelt, pepper, flour, fish, lemon, egg, butter. 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.