Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Apple Cake
Ingredients
Directions
The book says “a very moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Prepare the batter
Preheat the oven to 350°F (175°C).
Beat the egg whites and yolks separately.
Cream the butter and sugar together, then add the egg yolks.
Mix in the milk, flour, cream of tartar, and baking soda.
Fold in the beaten egg whites gently.
Bake and fill
Pour the batter into jelly tins.
Bake until golden.
Cook the grated apples, lemon juice, lemon rind, and beaten egg with sugar for 3 minutes.
Spread the apple mixture between the layers of the cake.
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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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Butter + creamtop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
Sugar + creamtop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
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Milk + appletop 11% of all pairsSmell alikemoderateCooked together4,104 recipes
Shared aroma: 4-heptenal (creamy, biscuit).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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
- Eggs
- Whites trapped by folding add lift, while yolks add richness and structure to the crumb.
- Butter
- Creaming with sugar traps air and adds fat for a tender texture.
- Flour
- Provides the starch and gluten network that gives the cake its structure.
- Cream of tartar
- Acidifies the batter and stabilises the egg whites, helping the cake rise.
- Baking soda
- Reacts with the acidic ingredients to produce gas that leavens the cake.
- Sour apples
- Add moisture, tartness and flavour to the cooked filling between the layers.
The step that matters
Folding in the beaten egg whites gently. Deflating the whites by stirring too hard releases the air bubbles that give the cake its lift, leaving a dense result.
Swap the apple
How well each one fits the dish's main ingredients (egg, sugar, butter, milk, flour, cream, lemon):
- Vanillafits better
- Raisinfits better
- Figfits better
- Applethe original
Fit is the average pairing score against egg, sugar, butter, milk, flour, cream, lemon. 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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