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Dessert

Rhubarb Custard

A custard made with stewed rhubarb, egg, flour, lemon juice, sugar, and water, baked until set.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Rhubarb and flour match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and cooks put them together in 670 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Rhubarb Custard

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

  1. Stew the rhubarb until tender, then mash it.

  2. Let it cool, then mix in the egg, flour, lemon juice, sugar, and water.

  3. Pour the mixture into a baking dish and bake at 350°F (175°C) without a top crust.

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. Rhubarb + flourtop 7% of all pairs
    Smell alikestrong
    Cooked together670 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Rhubarb + lemontop 7% of all pairs
    Smell alikestrong
    Cooked together546 recipes

    Shared aroma: acetic acid (sour, vinegar).

  3. Flour + sugartop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

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

    Shared aroma: isobutyraldehyde (malty, green).

  5. Flour + lemontop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Egg and flour barely smell alike, yet cooks put them together in 106,462 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

Rhubarb
Provides the tart flavour and most of the bulk of the filling once stewed and mashed.
Egg
Sets as it bakes, giving the custard its body and holding it together.
Flour
Thickens the filling so it holds its shape rather than running loose.
Lemon juice
Adds acidity that sharpens the sweetness and brightens the rhubarb flavour.
Sugar
Sweetens the tart rhubarb and balances its acidity.

The step that matters

Let the rhubarb cool before adding the egg. Egg proteins set and can scramble when they meet very hot mixtures. Cooling the mashed rhubarb first keeps the custard smooth and evenly textured when it bakes.

Swap the lemon

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

  1. Raisinfits better
  2. Vanillafits better
  3. Figfits about as well
  4. Lemonthe original

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