Name: Herring Roe on Toast
Ingredients: soft herring roes; croute (toasted bread); lemon juice; capers or sliced olives

Why it works: Lemon and capers match in chemistry and in kitchens. They rank in the top 5% of all ingredient pairs, and cooks put them together in 1,222 recipes. Both carry coumarin, which smells sweet, hay. The science ↓

Herring Roe on Toast

Ingredients

soft herring roes
croute (toasted bread)
lemon juice
capers or sliced olives

Directions

Prepare

Clean the herring roes in warm water, then boil them for 4 minutes, optionally adding lemon juice to the water.
Prepare a crout by toasting bread.

Assemble and bake

Arrange the cooked herring roes in a circle or cross on the crout.
Bake the toast with roes until heated through.

Serve

Serve with a few drops of lemon juice on the roes and garnish with capers or sliced olives.

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.

Lemon + caperstop 5% of all pairs

Smell alikestrong

Cooked together1,222 recipes

Shared aroma: coumarin (sweet, hay).
Bread + caperstop 15% of all pairs

Smell alikemoderate

Cooked together307 recipes

Shared aroma: coumarin (sweet, hay).
Roe + lemontop 18% of all pairs

Smell alikelow

Cooked together251 recipes

Shared aroma: 1-octen-3-ol (mushroom, earthy).
Roe + breadtop 19% of all pairs

Smell alikelow

Cooked together123 recipes

Shared aroma: (e)-2-octenal (fatty, green).
Bread + lemontop 20% of all pairs

Smell alikemoderate

Cooked together8,445 recipes

Shared aroma: 2-nonenal (fatty, green).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Soft herring roes: Provide the rich, creamy main filling that gives the toast its flavour and texture.
Croute (toasted bread): Forms a crisp base that holds the roes and stays firm under them.
Lemon juice: Adds acidity that brightens the rich, fatty roes.

“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.