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Dessert

Hard Egg Cookies

Cookies made from hard‑boiled eggs, butter, sugar, flour, and topped with jam.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Hard Egg Cookies

Oven, in the book's wordsA quick oven

Ingredients

Directions

The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.

Prepare

  1. Mash the yolks of the hard‑boiled eggs well.

  2. Mix in the sweet butter and sugar until combined.

  3. Add enough flour to form a medium stiff dough.

Shape and bake

  1. Roll out the dough thinly and cut into small rounds.

  2. Place jam on top of each round.

  3. Bake in a 400°F (200°C) oven until golden.

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. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  3. Egg + flourtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Egg + buttertop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

  5. Butter + sugartop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

Butter and flour 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

Hard-boiled eggs
Mashed yolks add richness and a tender, crumbly texture to the dough.
Sweet butter
Adds fat that makes the dough rich and tender and helps it brown in the oven.
Sugar
Adds sweetness and helps the cookies brown during baking.
Flour
Provides the structure that holds the dough together so it can be rolled and cut.

The step that matters

Add enough flour to form a medium stiff dough. Too little flour leaves the dough sticky and hard to cut, while too much makes the cookies dry and tough. Stiffness controls how the rounds hold their shape and bake.

“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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