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Dessert

Coffee Jelly

A baked pastry filled with Moka custard and coated in coffee icing.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 10 ingredients
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Why it works: Sugar and vanilla are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 35,032 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

Coffee Jelly

Oven, in the book's wordsA moderate oven

Ingredients

Directions

The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.

Make the paste

  1. In a saucepan, combine water, butter, sugar, and salt, then bring to a boil.

  2. Stir in the cornflour and Vienna flour mixed together and cook until it forms a soft paste that pulls away from the pan.

  3. Remove from heat, add vanilla essence, and gradually mix in the eggs (except for 1 white).

  4. Beat the mixture well for a few minutes.

Pipe and bake

  1. Transfer to a piping bag with a plain tip and pipe even shapes onto a lightly buttered baking sheet, spacing them 1 inch apart.

  2. Bake in a moderate oven at 350°F (175°C) until golden brown.

Fill and cover

  1. Once baked, split the sides with a sharp knife and fill each with 1 teaspoon of Moka custard.

  2. Dip each éclair into the coffee icing to cover completely and place on a wire rack to set.

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. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

    Shared aroma: beta-damascenone (apple, rose).

  2. Vanilla + coffeetop 9% of all pairs
    Smell alikemoderate
    Cooked together1,391 recipes

    Shared aroma: sotolon (curry, maple).

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

    Shared aroma: isobutyraldehyde (malty, green).

  4. Flour + vanillatop 12% of all pairs
    Smell alikemoderate
    Cooked together19,241 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Butter + vanillatop 14% of all pairs
    Smell alikemoderate
    Cooked together20,050 recipes

    Shared aroma: guaiacol (smoky, sweet).

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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

Butter
Adds richness and tenderness, and helps the dough cook into a smooth paste.
Eggs
Add moisture and structure, and help the paste puff and set as it bakes.
Cornflour
Thickens the paste so it holds its shape when piped.
Vienna flour
Provides flour structure to support the paste while it bakes.

The step that matters

Beating in the eggs. Eggs must be added gradually and the mixture beaten well so it becomes smooth and glossy. Adding them too fast can break the paste, leaving it too loose to hold shape or rise properly in the oven.

Swap the vanilla

How well each one fits the dish's main ingredients (butter, sugar, flour, egg, coffee):

  1. Vanillathe original
  2. Raisinfits about as well
  3. Figfits less well
  4. Bananafits less well

Fit is the average pairing score against butter, sugar, flour, egg, coffee. 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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