Mustard + Ketchup
A good pairing. Cooks put them together in 331 recipes, and they share 45 flavor molecules: the top 17% of all ingredient pairs. We hold little distinguishing chemistry for one of them, so the recipe count carries this verdict.
Do mustard and ketchup go together?
Yes. 331 recipes in our collection combine them, and they share 45 flavor molecules. That places them in the top 17% of every ingredient pair we score.
Read this with the evidence note above in mind.
Why they work
Almost everything ketchup carries, mustard has too: 45 of ketchup's 45 flavor molecules also occur in mustard. Among the shared key aromas are ethanol (alcoholic, ethereal) and decanoic acid (soapy, waxy).
What each one brings
mustard
The fresh, green side. Green notes make up 9% of its labelled aroma molecules, against 0% for ketchup. It carries 238 molecules ketchup doesn't have.
ketchup
The tartness. Sour notes make up 35% of its labelled aroma molecules, against 18% for mustard. Every molecule it carries is also in mustard.
Add a third ingredient
- Horseradish: the best fit for both, top 1% of pairs with mustard, top 10% with ketchup.
- Sauce: top 13% of pairs with mustard, top 1% with ketchup.
- Haddock: top 17% of pairs with mustard, top 1% with ketchup.
- Whiting: top 18% of pairs with mustard, top 1% with ketchup.
Ranked by the average of its two pairing scores. Only foods used in at least 100 recipes are suggested.
Recipes with mustard and ketchup
We have no browsable recipe that lists both mustard and ketchup.
Can you swap one for the other?
Only partly. Almost all of ketchup's flavor molecules (45 of 45) are also found in mustard, but mustard has 238 that ketchup lacks. Ketchup gives you part of mustard's character without most of its fresh, green side. This compares flavor only; texture, moisture and the job each does in a dish matter too.
All 45 shared molecules
See every shared molecule grouped by chemical class, with key aromas marked, plus the 238 only in mustard and the 0 only in ketchup.
Mustard and ketchup questions
Do mustard and ketchup go together?
A good pairing. Cooks put them together in 331 recipes, and they share 45 flavor molecules: the top 17% of all ingredient pairs. We hold little distinguishing chemistry for one of them, so the recipe count carries this verdict.
Why do mustard and ketchup taste good together?
Almost everything ketchup carries, mustard has too: 45 of ketchup's 45 flavor molecules also occur in mustard. Among the shared key aromas are ethanol (alcoholic, ethereal) and decanoic acid (soapy, waxy).
What goes with mustard and ketchup?
Horseradish is the best third ingredient: top 1% of pairs with mustard and top 10% with ketchup. Sauce and haddock also fit both.
Can I use ketchup instead of mustard?
Only partly. Almost all of ketchup's flavor molecules (45 of 45) are also found in mustard, but mustard has 238 that ketchup lacks. Ketchup gives you part of mustard's character without most of its fresh, green 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: Mustard vs Ketchup. https://compkitchen.com/compare/mustard-vs-ketchup. Accessed 2026-11-04.
@misc{compkitchen_compare_compound_similarity_analysis_mustard_vs_ketchup_2026,
title = {Compound similarity analysis: Mustard vs Ketchup},
author = {{Compound Kitchen}},
year = {2026},
url = {https://compkitchen.com/compare/mustard-vs-ketchup},
note = {Accessed: 2026-11-04}
}
Methodology DOI: 10.5281/zenodo.19719459 · CC BY 4.0 · Citations are a request, not a requirement.