When the best swap works
- Khaman dhokla rises identically with the soda-plus-lemon swap if you steam within 60 seconds of mixing — the reaction window matches Eno's 90-second active phase.
- Instant rava idli and uttapam batters take the substitute well because the semolina and rice flour bases tolerate the slightly tangier flavour from added citrus.
- Spongy patra and khandvi work cleanly — the thin batters trap CO2 from any acid-base reaction equally well, regardless of source.