Why it works: Lemon and pepper 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 ↓
Spinach with Egg Sauce
Ingredients
Directions
The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Cook the eggs
Place the eggs in a saucepan, cover with cold water, and bring to a boil.
Simmer for 15 minutes.
Drain the eggs and cover with cold water until cool.
Prepare and cook the spinach
Remove leaves and tender stems from the spinach and wash the spinach carefully, then drain the spinach.
Place the spinach in a saucepan with ½ teaspoon of salt and 1 cup of boiling water, and boil for 15 minutes.
Drain the spinach and press the spinach through a colander.
Add 1 tablespoon of butter, 1 tablespoon of lemon juice or vinegar, and pepper to the spinach, then keep the spinach warm.
Make the sauce
Rub together 2 tablespoons of butter and 1 tablespoon of flour.
Pour in 1 cup of boiling water and stir over heat until it boils.
Add 1 tablespoon of lemon juice, ¼ teaspoon of salt, and a dash of pepper to the sauce.
Remove the sauce from heat and stir in the beaten yolk of 1 egg.
Assemble and serve
Remove the shells from the hard‑boiled eggs, cut a thin slice from each end of the eggs, and cut the eggs in half crosswise.
Remove the yolks from the eggs.
Fill the cavities of the egg whites with the hot spinach, heaping it nicely, and place the filled eggs on a platter.
Pour the sauce over the eggs.
Season the yolks with salt and pepper, then press the yolks through a vegetable press to decorate the dish.
Place the eggs in a 350°F (175°C) oven for a few minutes.
Serve.
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.
-
Lemon + peppertop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + saucetop 15% of all pairsSmell alikelowCooked together15,338 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Egg + flourtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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
- Whole eggs are hard-boiled for stuffing, and a beaten yolk thickens the sauce.
- Spinach (in the method)
- Forms the main body of the dish, carrying the sauce and filling the egg whites.
- Butter
- Adds richness and flavor to the spinach and forms the base of the roux.
- Flour
- Thickens the sauce when cooked with butter into a roux.
- Lemon juice or vinegar
- Adds acidity that brightens the flavor of the spinach.
The step that matters
Stir in the beaten yolk of 1 egg off the heat. Egg yolk thickens when heated, and adding it to a boiling sauce can scramble it. Removing the sauce from heat first lets it thicken gently and smoothly.
Swap the lemon
How well each one fits the dish's main ingredients (egg, butter, pepper, sauce, flour):
- Lemonthe original
- Raisinfits about as well
- Avocadofits less well
- Limefits less well
Fit is the average pairing score against egg, butter, pepper, sauce, flour. 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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