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Lemon Sandwiches

A sandwich made with a lemon‑mustard butter spread on wheat and Boston brown bread.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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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 ↓

Lemon Sandwiches

Ingredients

Directions

Make the filling

  1. In a bowl, combine butter and mustard.

  2. Add hot water gradually to form a paste.

  3. Mix in cayenne pepper, egg yolk, and lemon juice until smooth.

Assemble and cut

  1. Spread the mixture evenly on slices of wheat and brown bread.

  2. Make sandwiches with one slice of wheat bread and one of brown.

  3. Trim the edges and cut diagonally into smaller pieces.

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. Pepper + lemontop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

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

  3. Mustard + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

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

  4. Wheat + breadtop 10% of all pairs
    Smell alikestrong
    Cooked together209 recipes

    Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).

  5. Mustard + lemontop 11% of all pairs
    Smell alikestrong
    Cooked together3,816 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

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

What each ingredient does

Butter
Provides fat and richness, giving the filling a smooth, spreadable body.
Egg yolk
Emulsifies with the butter and lemon juice, helping the filling become smooth and stable.
Lemon juice
Adds acidity that brightens the flavor and cuts through the richness of the butter.
Mustard
Adds sharp, pungent flavor and helps stabilize the emulsion.

The step that matters

Mix in cayenne pepper, egg yolk, and lemon juice until smooth. Adding the egg yolk and lemon juice to a butter paste can break or separate if added too quickly or too cold. Mixing gradually lets the yolk emulsify into the fat, producing a smooth, spreadable filling.

Swap the mustard

How well each one fits the dish's main ingredients (butter, pepper, egg, lemon, wheat, bread):

  1. Asparagusfits better
  2. Spinachfits better
  3. Capsicumfits better
  4. Mustardthe original

Fit is the average pairing score against butter, pepper, egg, lemon, wheat, bread. 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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