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Dessert

Rhubarb Sponge

A light, spongy dessert made from rhubarb, sugar, lemon, isinglass, cochineal, and whipped egg whites.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Lemon and rhubarb match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and cooks put them together in 546 recipes. Both carry acetic acid, which smells sour, vinegar. The science ↓

Rhubarb Sponge

Ingredients

Directions

Prepare the rhubarb

  1. Peel the rhubarb and cut it into small pieces.

  2. In a saucepan, combine the sugar and ½ cup of cold water over gentle heat until the sugar melts.

  3. Add the cut rhubarb and simmer slowly until tender.

  4. Rub the mixture through a fine sieve into a bowl.

Make the sponge

  1. Mix in the grated lemon rind, lemon juice, dissolved isinglass, and enough cochineal to achieve a pale pink color.

  2. Stir well for a few minutes and place the bowl in a cold area.

  3. Once the mixture is cold and starting to thicken, whisk in the whipped egg whites.

  4. Beat the mixture until thick and spongy.

Serve

  1. Serve the sponge piled high in a glass dish, surrounded by raspberry jelly or stewed pears.

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. Lemon + rhubarbtop 7% of all pairs
    Smell alikestrong
    Cooked together546 recipes

    Shared aroma: acetic acid (sour, vinegar).

  2. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

    Shared aroma: 2-nonenal (fatty, green).

  3. Sugar + rhubarbtop 18% of all pairs
    Smell alikemoderate
    Cooked together1,852 recipes

    Shared aroma: 1-penten-3-one (fish, pungent).

  4. Lemon + eggtop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

  5. Sugar + eggtop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

    Shared aroma: 2-nonenal (fatty, green).

Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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

Egg whites
Whipped whites trap air, giving the sponge its light, spongy texture.
Isinglass
Sets the mixture as it cools, giving the sponge its firm, holding structure.
Rhubarb
Provides the tart, fruity flavor and the bulk of the pulp in the sponge.
Loaf sugar
Sweetens the dish and balances the tartness of the rhubarb and lemon.

The step that matters

Whisk the egg whites into a cold, thickening mixture. Egg whites whip best when cold and clean, and they hold air only if the base is cool enough not to deflate them. Whisking into a warm mixture can collapse the foam and lose the light, spongy texture.

Swap the rhubarb

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

  1. Cinnamonfits better
  2. Nutmegfits better
  3. Parsleyfits better
  4. Rhubarbthe original

Fit is the average pairing score against sugar, lemon, egg. 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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