Onion + Leek
A proven pairing. Cooks put them together in 1,326 recipes, and they share 235 flavor molecules: the top 4% of all ingredient pairs.
Do onion and leek go together?
Yes. 1,326 recipes in our collection combine them, and they share 235 flavor molecules. That places them in the top 4% of every ingredient pair we score.
Why they work
Almost everything leek carries, onion has too: 235 of leek's 261 flavor molecules also occur in onion. Among the shared key aromas are ethyl butyrate (apple, fruity) and 2-nonanone (fruity, floral).
What each one brings
onion
The savoury side. Savory notes make up 8% of its labelled aroma molecules, against 1% for leek. It carries 130 molecules leek doesn't have.
leek
The floral side. Floral notes make up 13% of its labelled aroma molecules, against 8% for onion. It carries 26 molecules onion doesn't have.
Add a third ingredient
- Turnip: the best fit for both, top 5% of pairs with onion, top 1% with leek.
- Chive: top 3% of pairs with onion, top 1% with leek.
- Sorrel: top 10% of pairs with onion, top 1% with leek.
- Garlic: top 1% of pairs with onion, top 4% with leek.
Ranked by the average of its two pairing scores. Only foods used in at least 100 recipes are suggested.
Recipes with onion and leek
Almost always mains: 1 of the 1 recipes with a course label are mains.
Can you swap one for the other?
Only partly. Almost all of leek's flavor molecules (235 of 261) are also found in onion, but onion has 130 that leek lacks. Leek gives you part of onion's character without most of its savoury side. This compares flavor only; texture, moisture and the job each does in a dish matter too.
All 235 shared molecules
See every shared molecule grouped by chemical class, with key aromas marked, plus the 130 only in onion and the 26 only in leek.
Onion and leek questions
Do onion and leek go together?
A proven pairing. Cooks put them together in 1,326 recipes, and they share 235 flavor molecules: the top 4% of all ingredient pairs.
Why do onion and leek taste good together?
Almost everything leek carries, onion has too: 235 of leek's 261 flavor molecules also occur in onion. Among the shared key aromas are ethyl butyrate (apple, fruity) and 2-nonanone (fruity, floral).
What goes with onion and leek?
Turnip is the best third ingredient: top 5% of pairs with onion and top 1% with leek. Chive and sorrel also fit both.
What can you make with onion and leek?
Almost always mains: 1 of the 1 recipes with a course label are mains. Common dishes include Kuzu Sebze.
Can I use leek instead of onion?
Only partly. Almost all of leek's flavor molecules (235 of 261) are also found in onion, but onion has 130 that leek lacks. Leek gives you part of onion's character without most of its savoury side. This compares flavor only; texture, moisture and the job each does in a dish matter too.
Compare other ingredients
Ranks compare this pair with 20,000 random ingredient pairs on CompKitchen. Molecule counts are what the studies and databases we aggregate have reported for each ingredient: a measure of coverage, not a full census. How we score pairs
Cite this analysis
Compound Kitchen (2026). Compound similarity analysis: Onion vs Leek. https://compkitchen.com/compare/onion-vs-leek. Accessed 2026-11-04.
@misc{compkitchen_compare_compound_similarity_analysis_onion_vs_leek_2026,
title = {Compound similarity analysis: Onion vs Leek},
author = {{Compound Kitchen}},
year = {2026},
url = {https://compkitchen.com/compare/onion-vs-leek},
note = {Accessed: 2026-11-04}
}
Methodology DOI: 10.5281/zenodo.19719459 · CC BY 4.0 · Citations are a request, not a requirement.