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Substitutions · 8 dishes here use it
Sour without liquid, which is a genuinely useful thing to own — it brightens a finished dish where a squeeze of lemon would make it wet. Also crimson, so it doubles as color.
Everything below is judged against that job. A swap that covers it is a swap; one that only looks similar is not.
1 of the 8 dishes here that mention sumac list it as optional — 13% of them. In those, the correct substitution is nothing.
Functional substitution system
For sumac, the page's working definition is: Sour without liquid, which is a genuinely useful thing to own — it brightens a finished dish where a squeeze of lemon would make it wet. Also crimson, so it doubles as color. 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.
Instead · 1
the zest of half a lemon per teaspoon
Instead · 2
half as much
Instead · 3
twice as much
These dishes list sumac as optional. They were written to work without it, so no ratio is needed and nothing has to be bought.
These need it and are short enough that nothing hides: 4 required ingredients or fewer. Make the swap a decision rather than a repair.
The company sumac keeps in this library, counted off required ingredients. A swap that argues with the top two is the wrong swap, whatever a chart says.