Why it works: Milk and butter 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 ↓
Potato Custard
Ingredients
Directions
The book says “a quick oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Prepare the potatoes
Wash the potatoes and parboil them, then let them cool completely.
Once cold, peel and grate the potatoes.
Make the custard
Beat the butter, sugar, and egg yolks until very light.
Gradually add the grated potatoes while stirring continuously.
Mix in the milk, cinnamon, and remaining ingredients.
Pour into a baking dish and bake at 350°F (175°C) for 30 minutes.
Top and finish
Beat the egg whites to stiff peaks with 2 tablespoons of powdered sugar.
Spread the egg whites over the custard and return to the oven until lightly browned.
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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Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Potato + milktop 9% of all pairsSmell alikemoderateCooked together3,611 recipes
Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
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Cinnamon + milktop 10% of all pairsSmell alikemoderateCooked together12,655 recipes
Shared aroma: cuminaldehyde (Spicy, cumin).
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Cinnamon + sugartop 10% of all pairsSmell alikelowCooked together30,779 recipes
Shared aroma: guaiacol (smoky, sweet).
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Potato + cinnamontop 10% of all pairsSmell alikemoderateCooked together1,012 recipes
Shared aroma: alpha-pinene (pine, turpentine).
Cinnamon and sugar barely smell alike, yet cooks put them together in 30,779 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
- Potatoes
- Provide the starchy body that thickens the custard and gives it a soft, pudding-like texture.
- Eggs
- Set the custard as they cook and add richness; the whites become a light, browned topping.
- Butter
- Adds fat for richness and a smooth, tender texture in the custard.
- Sugar
- Sweetens the custard and helps the egg whites hold stiff peaks and brown lightly.
- Milk
- Supplies liquid that sets with the eggs and potato into a creamy custard.
The step that matters
Beat the butter, sugar, and egg yolks until very light. Beating incorporates air and dissolves sugar into the fat, creating a light base; under-beating leaves a denser custard. Adding the grated potato gradually while stirring keeps the mixture smooth rather than lumpy.
Swap the potato
How well each one fits the dish's main ingredients (cinnamon, egg, milk, sugar, butter):
- Sweet potatofits better
- Capsicumfits about as well
- Potatothe original
- Asparagusfits about as well
Fit is the average pairing score against cinnamon, egg, milk, sugar, 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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