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Substitutions · 49 dishes here use it
Out of dijon
Sharpness and, more usefully, emulsifying power — a spoonful is what holds oil and vinegar together in a dressing that would otherwise split. Cooked hard it loses the sharp part and keeps the body.
Everything below is judged against that job. A swap that covers it is a swap; one that only looks similar is not.
17 of the 49 dishes here that mention dijon list it as optional — 35% of them. In those, the correct substitution is nothing.
Functional substitution system
Replace the job, then correct the side effects
For dijon, the page's working definition is: Sharpness and, more usefully, emulsifying power — a spoonful is what holds oil and vinegar together in a dressing that would otherwise split. Cooked hard it loses the sharp part and keeps the body. The swap cards below are judged against that job rather than visual resemblance.
Job → candidate → side effects → small test → correct.
1 · Job
What is the missing ingredient doing?
2 · Candidate
Choose the shelf item that replaces that function.
3 · Side effects
Check water, fat, salt, acid, sweetness, and texture.
4 · Small test
Change a spoonful or small portion first when possible.
5 · Correct
Taste again and move only the axis that is still wrong.
The company dijon keeps in this library, counted off required ingredients. A swap that argues with the top two is the wrong swap, whatever a chart says.