Why it works: Butter and potato match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and 6,445 recipes mention both. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
The recipe
Ingredients
Contains: egg, milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Mix and shape
Combine shredded codfish, butter, mashed potatoes, and beaten egg in a bowl.
Save 1 teaspoon of beaten egg and mix it with a little water.
Form the mixture into balls.
Roll each ball in the egg wash and coat with flour.
Fry
Fry the balls in hot oil until they are nice and brown.
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 + potatotop 6% of all pairsAroma overlapstrongMentioned together6,445 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Butter + flourtop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + eggtop 8% of all pairsAroma overlapstrongMentioned together118,511 recipes
Shared aroma: nonanal (fat, citrus).
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Egg + flourtop 8% of all pairsAroma overlaplowMentioned together104,138 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Potato + flourtop 9% of all pairsAroma overlaplowMentioned together5,160 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour share little aroma chemistry, yet 122,858 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
- Shredded codfish
- Supplies the main fish flavor and the flaky texture of the balls.
- Mashed potatoes
- Adds bulk and moisture, giving the balls a soft, tender interior.
- Egg
- Binds the mixture together, and its proteins set as the balls cook.
- Butter
- Adds fat for richness and a softer, more tender texture.
- Flour
- Forms a dry coating that helps the outside brown when fried.
The step that matters
Frying until brown. The flour coating browns through the Maillard reaction in hot oil, so the balls need enough heat to crisp the outside before the soft filling overcooks or breaks apart.
Flavor stand-ins for the potato
How well each one fits the dish's main ingredients (butter, egg, flour):
- Asparagusabout as good a flavor fit
- Shallotabout as good a flavor fit
- Chiveabout as good a flavor fit
- Potatothe original
Fit is the average pairing score against butter, egg, flour. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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