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 Pie
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. The book gives no cooking times; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.
Prepare the filling
Preheat the oven to 350°F (175°C).
Mix 1 cup of sugar and flour together, then add the mixture to the chopped rhubarb.
Beat the egg yolks and mix them with the melted butter.
Assemble and bake
Line a pie plate with pie crust.
Fill the pie plate with the rhubarb mixture.
Bake for 30-35 minutes.
Top with meringue
Whip the egg whites until stiff.
Gradually add 2 tablespoons of sugar to make a meringue.
Spread the meringue over the pie.
Return the pie to the oven for an additional 10 minutes until golden.
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.
Photo for illustrative purposes only · Contact us to use it
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.
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Rhubarb + flourtop 7% of all pairsSmell alikestrongCooked together670 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + flourtop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Flour + eggtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
Flour and butter 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
- Rhubarb
- Provides the tart flavor and the main body of the filling.
- Sugar
- Sweetens the tart rhubarb and helps stabilize the egg white meringue.
- Flour
- Thickens the rhubarb juices so the filling sets rather than running.
- Eggs
- Yolks enrich and bind the filling; whites whipped into meringue give the topping its airy structure.
- Butter
- Adds richness and fat that softens the filling's texture and flavor.
The step that matters
Whipping the egg whites until stiff. Egg whites must be fully whipped without any trace of yolk or grease, since fat stops them from foaming. Stiff, glossy peaks hold the meringue's shape and air during baking.
Swap the rhubarb
How well each one fits the dish's main ingredients (sugar, flour, egg, butter):
- Cinnamonfits better
- Nutmegfits better
- Jalapenofits better
- Rhubarbthe original
Fit is the average pairing score against sugar, flour, egg, butter. 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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