Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and 81,283 recipes mention both. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Eggs Au Gratin
Ingredients
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the sauce
In a saucepan, melt the butter over medium heat.
Stir in the flour and cook for a minute.
Gradually add the milk, stirring constantly until the mixture thickens.
Let it boil for 15 minutes, then add the thick cream, pepper, and salt.
Assemble and brown
Cut the hard-boiled eggs into quarters and add them to the sauce.
Transfer the mixture to a gratin dish and brown in a 400°F (200°C) oven.
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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Butter + milktop 7% of all pairsAroma overlapmoderateMentioned together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Butter + creamtop 8% of all pairsAroma overlapmoderateMentioned together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + milktop 14% of all pairsAroma overlaplowMentioned together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + eggtop 15% of all pairsAroma overlaplowMentioned together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour share little aroma chemistry, yet 124,287 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
- Butter
- Melted with the flour to form a base that carries flavour and richness into the sauce.
- Flour
- Thickens the sauce when cooked in butter and then combined with the liquid.
- Milk
- Forms the liquid body of the sauce, which thickens as the starch swells and sets.
- Thick cream
- Adds richness and a smoother, silkier mouthfeel to the finished sauce.
- Hard-boiled eggs
- Make up the main body of the dish, giving substance and a soft, tender texture in the sauce.
The step that matters
Adding the milk gradually while stirring constantly. Flour needs to be dispersed evenly in the liquid so its starch granules hydrate and swell smoothly. Adding the milk slowly and stirring prevents lumps and gives a uniformly thick sauce.
“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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