Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
To Fry Calf's Liver and Bacon
Ingredients
Directions
Prepare
Soak the liver in water for 30 minutes.
Dry the liver with a cloth and coat it in flour.
Cook and serve
Fry the bacon and parsley in a pan until crispy.
Add the liver to the pan and cook until browned.
Mix flour with ½ cup water and butter, then pour into the pan.
Stir well and cook until the sauce thickens.
Serve the liver and bacon with the sauce poured over.
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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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + parsleytop 12% of all pairsSmell alikemoderateCooked together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + parsleytop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
-
Liver + parsleytop 17% of all pairsSmell alikelowCooked together1,095 recipes
Shared aroma: alpha-pinene (pine, turpentine).
-
Liver + buttertop 19% of all pairsSmell alikemoderateCooked together2,065 recipes
Shared aroma: guaiacol (smoky, sweet).
Flour and butter 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
- Calf's liver
- Forms the main meat, browning to a crisp outside while staying tender inside.
- Bacon
- Renders fat into the pan and adds salty, savoury flavour and crispness.
- Flour
- Coats the liver for browning and thickens the pan sauce.
- Butter
- Adds fat for richer flavour and helps the sauce become smooth.
The step that matters
Dry the liver before coating it in flour. Surface moisture makes flour clump and steam instead of forming an even coating, so the liver browns poorly. Patting it dry lets the flour brown properly in the hot pan.
Swap the parsley
How well each one fits the dish's main ingredients (liver, flour, butter):
- Capersfits better
- Sagefits about as well
- Nutmegfits about as well
- Parsleythe original
Fit is the average pairing score against liver, flour, butter. 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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