Onion + Fish sauce
A cook's pairing more than a chemical one: 869 recipes use both, though they share little aroma. They rank in the top 28% of all ingredient pairs.
Do onion and fish sauce go together?
Yes, in practice. 869 recipes in our collection combine them, and they share 10 flavor molecules. That places them in the top 28% of every ingredient pair we score.
What they have in common
They overlap on 10 flavor molecules: 43% of fish sauce's 23. Among the shared key aromas are decanal (soap, orange peel) and octanal (fat, soap). So the pairing rests more on how cooks use them than on shared aroma.
What each one brings
onion
The tartness. Sour notes make up 15% of its labelled aroma molecules, against 0% for fish sauce. It carries 355 molecules fish sauce doesn't have.
fish sauce
The fresh, green side. Green notes make up 44% of its labelled aroma molecules, against 8% for onion. It carries 13 molecules onion doesn't have.
Add a third ingredient
- Garlic: the best fit for both, top 1% of pairs with onion, top 26% with fish sauce.
- Lemon grass: top 11% of pairs with onion, top 10% with fish sauce.
- Sesame: top 4% of pairs with onion, top 22% with fish sauce.
- Soybean sauce: top 10% of pairs with onion, top 13% with fish sauce.
Ranked by the average of its two pairing scores. Only foods used in at least 100 recipes are suggested.
Recipes with onion and fish sauce
We have no browsable recipe that lists both onion and fish sauce.
Can you swap one for the other?
Not really. Each has a lot the other lacks: onion has 355 molecules fish sauce doesn't, and fish sauce has 13 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 10 shared molecules
See every shared molecule grouped by chemical class, with key aromas marked, plus the 355 only in onion and the 13 only in fish sauce.
Onion and fish sauce questions
Do onion and fish sauce go together?
A cook's pairing more than a chemical one: 869 recipes use both, though they share little aroma. They rank in the top 28% of all ingredient pairs.
What do onion and fish sauce have in common?
They overlap on 10 flavor molecules: 43% of fish sauce's 23. Among the shared key aromas are decanal (soap, orange peel) and octanal (fat, soap). So the pairing rests more on how cooks use them than on shared aroma.
What goes with onion and fish sauce?
Garlic is the best third ingredient: top 1% of pairs with onion and top 26% with fish sauce. Lemon grass and sesame also fit both.
Can I use fish sauce instead of onion?
Not really. Each has a lot the other lacks: onion has 355 molecules fish sauce doesn't, and fish sauce has 13 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 Fish Sauce. https://compkitchen.com/compare/onion-vs-fish-sauce. Accessed 2026-11-05.
@misc{compkitchen_compare_compound_similarity_analysis_onion_vs_fish_sauce_2026,
title = {Compound similarity analysis: Onion vs Fish Sauce},
author = {{Compound Kitchen}},
year = {2026},
url = {https://compkitchen.com/compare/onion-vs-fish-sauce},
note = {Accessed: 2026-11-05}
}
Methodology DOI: 10.5281/zenodo.19719459 · CC BY 4.0 · Citations are a request, not a requirement.