Why it works: Potato and onion are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Potato Croquettes
Ingredients
Directions
Make the mixture
Mix all ingredients except the egg until well combined.
When slightly cool, add the yolk of the egg and mix well.
Coat and fry
Shape the mixture into rolls and roll in fine bread crumbs.
Dip in beaten egg white, then roll in crumbs again.
Fry in hot lard for one minute until golden 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.
Photo for illustrative purposes only · Contact us to use it
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.
-
Potato + oniontop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Potato + celerytop 7% of all pairsSmell alikemoderateCooked together2,047 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Butter + breadtop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
-
Celery + oniontop 7% of all pairsSmell alikemoderateCooked together18,518 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Potato + buttertop 13% of all pairsSmell alikemoderateCooked together6,456 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Mashed potatoes
- Form the bulk of the croquette and give a soft, tender interior.
- Egg
- Binds the mixture, and the white helps the crumb coating stick and crisp.
- Butter
- Adds fat for richness and a softer, more tender texture.
- Bread crumbs
- Form a crisp outer crust that browns when fried.
The step that matters
Frying in hot lard. Frying in hot fat browns the crumb coating quickly and crisps it before the soft potato interior overheats or the coating absorbs excess grease. Fat that is not hot enough lets the croquettes soak up oil and fall apart.
Swap the onion
The recipe marks onion as optional. How well each one fits the dish's main ingredients (potato, butter, white pepper, celery, egg, bread):
- Asparagusfits better
- Chivefits better
- Leekfits better
- Onionthe original
Fit is the average pairing score against potato, butter, white pepper, celery, egg, bread. 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.
More potato croquettes recipes
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.

Brown Bread461 recipes
Cream of Celery Soup113 recipes
White Bread80 recipes
Potato Rolls78 recipes