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Sardine Sandwiches

A sandwich made with sardine paste, ketchup, salt, pepper, buttered bread, and crisp lettuce.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Tomato and lettuce are a kitchen classic. They rank in the top 6% of all ingredient pairs, and cooks put them together in 1,655 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Sardine Sandwiches

Ingredients

Directions

Prepare the filling

  1. Bone the sardines and pound them into a smooth paste.

  2. Add a little tomato ketchup, salt, and pepper to the sardine paste.

Assemble the sandwiches

  1. Butter the pieces of bread.

  2. Lay crisp lettuce leaves on the buttered bread.

  3. Spread the sardine paste on the lettuce and top with another piece of bread.

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.

  1. Tomato + lettucetop 6% of all pairs
    Smell alikemoderate
    Cooked together1,655 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Bread + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

  3. Tomato + peppertop 7% of all pairs
    Smell alikemoderate
    Cooked together17,923 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Pepper + lettucetop 9% of all pairs
    Smell alikemoderate
    Cooked together4,037 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  5. Tomato + breadtop 10% of all pairs
    Smell alikemoderate
    Cooked together1,013 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

Sardines
Provide the main savoury filling, becoming a smooth paste that spreads evenly.
Butter
Coats the bread, adding richness and creating a barrier against moisture from the filling.
Crisp lettuce leaves
Add a cool, crisp texture and a layer that keeps the bread from soaking up the paste.
Tomato ketchup
Adds sweetness and acidity to balance the richness of the sardines.

The step that matters

Pounding the sardines into a smooth paste. If the sardines are not pounded fine, the filling stays lumpy and bones or flakes can remain, making it hard to spread and unpleasant to eat. Thorough mashing breaks down the flesh so it blends evenly with the seasonings.

Swap the lettuce

How well each one fits the dish's main ingredients (tomato, ketchup, pepper, bread, butter):

  1. Capsicumfits better
  2. Carrotfits better
  3. Potatofits better
  4. Lettucethe original

Fit is the average pairing score against tomato, ketchup, pepper, bread, 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.

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