Onion + Capsicum
A proven pairing. Cooks put them together in 23,390 recipes, and they share 241 flavor molecules: the top 9% of all ingredient pairs.
Do onion and capsicum go together?
Yes. 23,390 recipes in our collection combine them, and they share 241 flavor molecules. That places them in the top 9% of every ingredient pair we score.
Why they work
More than half of onion's flavor molecules (241 of 365) also occur in capsicum. Among the shared key aromas are 2-isopropyl-3-methoxypyrazine (earthy, pea) and 2,4-decadienal (seaweed).
What each one brings
onion
The sulfurous side. Sulfurous notes make up 13% of its labelled aroma molecules, against 2% for capsicum. It carries 124 molecules capsicum doesn't have.
capsicum
The fruit. Fruity notes make up 15% of its labelled aroma molecules, against 9% for onion. It carries 160 molecules onion doesn't have.
Add a third ingredient
- Cumin: the best fit for both, top 6% of pairs with onion, top 1% with capsicum.
- Okra: top 4% of pairs with onion, top 2% with capsicum.
- Sesame: top 4% of pairs with onion, top 3% with capsicum.
- Garlic: top 1% of pairs with onion, top 8% with capsicum.
Ranked by the average of its two pairing scores. Only foods used in at least 100 recipes are suggested.
Recipes with onion and capsicum
Mostly mains: 35 of the 52 recipes with a course label are mains.
Can you swap one for the other?
Not really. Each has a lot the other lacks: onion has 124 molecules capsicum doesn't, and capsicum has 160 that onion doesn't. Treat them as partners, not stand-ins. This compares flavor only; texture, moisture and the job each does in a dish matter too.
All 241 shared molecules
See every shared molecule grouped by chemical class, with key aromas marked, plus the 124 only in onion and the 160 only in capsicum.
Onion and capsicum questions
Do onion and capsicum go together?
A proven pairing. Cooks put them together in 23,390 recipes, and they share 241 flavor molecules: the top 9% of all ingredient pairs.
Why do onion and capsicum taste good together?
More than half of onion's flavor molecules (241 of 365) also occur in capsicum. Among the shared key aromas are 2-isopropyl-3-methoxypyrazine (earthy, pea) and 2,4-decadienal (seaweed).
What goes with onion and capsicum?
Cumin is the best third ingredient: top 6% of pairs with onion and top 1% with capsicum. Okra and sesame also fit both.
What can you make with onion and capsicum?
Mostly mains: 35 of the 52 recipes with a course label are mains. Common dishes include Capsicum Chana Dal, Spanish Onions--Pickled, Stuffed Onions with Meat, Argentine Vegetable Beef Stew.
Can I use capsicum instead of onion?
Not really. Each has a lot the other lacks: onion has 124 molecules capsicum doesn't, and capsicum has 160 that onion doesn't. Treat them as partners, not stand-ins. 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 Capsicum. https://compkitchen.com/compare/onion-vs-capsicum. Accessed 2026-11-04.
@misc{compkitchen_compare_compound_similarity_analysis_onion_vs_capsicum_2026,
title = {Compound similarity analysis: Onion vs Capsicum},
author = {{Compound Kitchen}},
year = {2026},
url = {https://compkitchen.com/compare/onion-vs-capsicum},
note = {Accessed: 2026-11-04}
}
Methodology DOI: 10.5281/zenodo.19719459 · CC BY 4.0 · Citations are a request, not a requirement.