Why it works: Flour and raisin match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 9,075 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Imperial Cake
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.
Prepare
Preheat the oven to 350°F (175°C).
Make the batter
Cream the butter and sugar together until light and fluffy.
Add the beaten eggs gradually, mixing well.
Sift the flour and baking soda together, then fold into the mixture.
Stir in the lemon juice, grated lemon rind, raisins, and chopped walnuts.
Flour the raisins and walnuts with a scant tablespoon of flour.
Bake
Pour the batter into a greased cake pan and bake for 1.5 hours or until a toothpick comes out clean.
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.
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Flour + raisintop 1% of all pairsSmell alikestrongCooked together9,075 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Lemon + walnuttop 10% of all pairsSmell alikestrongCooked together2,149 recipes
Shared aroma: 2-nonenal (fatty, green).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + walnuttop 12% of all pairsSmell alikemoderateCooked together5,873 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Raisin + walnuttop 13% of all pairsSmell alikemoderateCooked together647 recipes
Shared aroma: 1-octen-3-ol (mushroom, earthy).
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
- Butter
- Creamed with sugar to trap air, giving the cake a tender, rich crumb.
- Eggs
- Add structure and richness as they set in the batter.
- Flour
- Forms the structure of the cake as the batter sets.
- Baking soda
- Reacts with the acidic lemon juice to produce gas that helps the cake rise.
- Raisins
- Add chewy texture and sweetness throughout the cake.
- Walnuts
- Add crunch and a nutty flavour that contrasts the soft crumb.
The step that matters
Folding in the flour and baking soda. Overmixing once the flour is added develops gluten, which toughens the cake and can make it dense. Fold gently, just until no dry flour remains, so the batter keeps the air and gas needed for a light rise.
Swap the lemon
How well each one fits the dish's main ingredients (butter, flour, sugar, raisin, walnut, egg):
- Vanillafits better
- Figfits better
- Coconutfits about as well
- Lemonthe original
Fit is the average pairing score against butter, flour, sugar, raisin, walnut, 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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