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 ↓
Liver and Bacon
Ingredients
Directions
Prepare the liver
Dip each slice of calf's liver in flour.
Fry the liver in bacon fat for about 8 minutes, using 1 slice of bacon for each slice of liver.
Remove the liver and bacon from the pan and cover to keep warm.
Make the gravy
Drain excess fat from the pan and sprinkle in 1 tablespoon of flour.
Rub the flour into the pan with the back of a spoon.
Pour in 1 cup of water, add pepper, coarse sea salt, and a squeeze of lemon juice.
If needed, add a few drops of burnt sugar.
Boil for 5 minutes, then strain the gravy over the liver and bacon.
Serve
Serve hot.
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).
-
Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
-
Flour + lemontop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Lemon + sugartop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Flour + peppertop 19% of all pairsSmell alikemoderateCooked together50,459 recipes
Shared aroma: isobutyraldehyde (malty, green).
Lemon and sugar barely smell alike, yet cooks put them together in 53,532 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
- Calf's liver
- Forms the main body of the dish, cooked quickly to stay tender inside and browned outside.
- Flour
- Coats the liver for browning and later thickens the pan juices into a gravy.
- Bacon fat
- Fries the liver, adding fat for browning and a smoky, savoury flavour.
- Bacon slices
- Add salty, smoky flavour and fat that complements the liver.
- Lemon juice
- Adds acidity that brightens the rich gravy and liver.
The step that matters
Fry the liver briefly. Liver turns dry and grainy when overcooked, because its proteins tighten and lose moisture with prolonged heat. Frying for a set time keeps it tender.
“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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