Why it works: Milk and lemon match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and 19,048 recipes mention both. Both carry 2-nonenal, which smells fatty, green. The science ↓
The recipe
Ingredients
Contains: egg, milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
The book says “a slow oven”. The 300°F (150°C) in the steps is the modern equivalent, not the book's own figure.
Make the cream
In a saucepan, combine flour and milk.
Add the egg yolks.
Sweeten with sugar to taste.
Simmer until the mixture thickens.
Flavour and shape
Pound the ratafia cakes with lemon peel.
Mix the ratafia and lemon peel into the cream.
Let the mixture cool.
Line a tart pan with the mixture.
Bake and finish
Bake in a slow oven at 300°F (150°C).
Once baked, ice with sifted sugar using a hot salamander.
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 aroma chemistry they share, and how many recipes mention both.
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Milk + lemontop 7% of all pairsAroma overlapstrongMentioned together19,048 recipes
Shared aroma: 2-nonenal (fatty, green).
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Flour + milktop 8% of all pairsAroma overlaplowMentioned together76,993 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + eggtop 8% of all pairsAroma overlaplowMentioned together104,138 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Milk + eggtop 9% of all pairsAroma overlapmoderateMentioned together88,465 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + lemontop 9% of all pairsAroma overlapmoderateMentioned together43,327 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
Flour and milk share little aroma chemistry, yet 76,993 recipes mention both: they likely 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
- Flour
- Starch swells as it heats with the milk, giving the cream body and structure.
- Milk
- Forms the liquid base of the cream and keeps the filling moist.
- Egg yolks
- Thicken and enrich the cream as they heat and set.
- Sugar
- Sweetens the cream and sweetens the finished icing layer.
- Ratafia cakes
- Add a sweet, nutty aroma and some crumb texture to the cream.
The step that matters
Simmer until the mixture thickens. The flour starch swells and the egg yolks set as the cream heats, so the filling thickens. Too much heat can curdle the yolks, while too little leaves a runny filling that will not hold its shape in the tart.
Flavor stand-ins for the lemon
How well each one fits the dish's main ingredients (flour, milk, egg, sugar):
- Vanillabetter flavor fit
- Raisinbetter flavor fit
- Figabout as good a flavor fit
- Lemonthe original
Fit is the average pairing score against flour, milk, egg, sugar. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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