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Dessert

Chocolate Eclairs

Chocolate eclairs are oblong pastries filled with a chocolate icing and a milk-based filling.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 12 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Chocolate Eclairs

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.

Make the pastry

  1. Combine boiling water and butter in a saucepan and bring to a boil.

  2. Stir in flour, beating with a potato masher until smooth.

  3. Remove from heat and let cool.

  4. Gradually add eggs, beating well after each addition for 20 minutes.

  5. Spread the mixture into oblong pieces about 3 inches by 1 inch on a baking pan.

  6. Bake for 25 minutes at 400°F (200°C).

Make the chocolate topping

  1. Melt chocolate with powdered sugar and boiling water over low heat until smooth.

Fill and finish

  1. Cut eclairs open and fill with the filling.

  2. Combine milk, sugar, eggs, flour, and salt in a double boiler. Cook for about 15 minutes, stirring constantly.

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 + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

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

    Shared aroma: isobutyraldehyde (malty, green).

  3. Chocolate + sugartop 13% of all pairs
    Smell alikemoderate
    Cooked together15,404 recipes

    Shared aroma: guaiacol (smoky, sweet).

  4. Chocolate + milktop 13% of all pairs
    Smell alikemoderate
    Cooked together9,128 recipes

    Shared aroma: gamma-nonanolactone (coconut, sweet).

  5. Flour + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

Eggs
Add structure and lift, letting the choux paste puff and set as it bakes.
All-purpose flour
Forms the starch structure that holds the cooked paste's shape.
Butter
Adds fat for tenderness and rich flavor in the pastry.
Milk
Provides the liquid that thickens into a creamy custard filling.
Sugar
Adds sweetness and helps the filling stay soft and smooth.
Chocolate
Provides the rich chocolate flavor and a glossy, set topping.

The step that matters

Gradually add eggs, beating well after each addition. Each egg must be fully blended in before the next is added. This builds a smooth, stable batter that traps steam and puffs during baking, while adding eggs too fast can make it break and turn greasy.

“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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