Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Ax Excellent Receipt for French Beans a LA Francaise
Ingredients
Directions
Prepare the beans
Prepare the beans and boil them until tender, then drain well.
Make the sauce
In a clean saucepan, melt the butter and stir in the flour until smooth.
Gently simmer the butter and flour mixture until lightly browned, then add salt and pepper.
Gradually pour in the veal gravy (or cream) and toss the beans in the sauce until hot.
Quickly stir in the beaten egg yolks and lemon juice just before serving.
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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Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Beans + peppertop 11% of all pairsSmell alikemoderateCooked together4,733 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Beans + flourtop 11% of all pairsSmell alikemoderateCooked together2,080 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Beans + lemontop 12% of all pairsSmell alikestrongCooked together1,474 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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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
- Butter
- Forms the base of the roux and adds richness and a rounded flavour to the sauce.
- Flour
- Thickens the butter into a roux that gives the sauce body and lightly browned flavour.
- Veal gravy
- Supplies the savoury liquid that becomes the body of the sauce.
- Egg yolks
- Enrich and thicken the sauce slightly as they gently set with the heat.
- Lemon juice
- Adds acidity that brightens the richness of the butter and yolks.
The step that matters
Quickly stir in the beaten egg yolks and lemon juice just before serving. Egg yolks set when heated and can curdle or scramble if the sauce is too hot or boils after they go in. Adding them last, off the heat or at low heat, keeps the sauce smooth and creamy.
Swap the beans
How well each one fits the dish's main ingredients (butter, flour, pepper, veal, egg, lemon):
- Almondfits better
- Walnutfits better
- Pistachiofits better
- Beansthe original
Fit is the average pairing score against butter, flour, pepper, veal, egg, 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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