Choose the substitute closest to fresh zest (lemon/key lime first); if using juice-based options, plan to boost intensity.
Measure using the listed ratio; if your substitute is sweeter (orange/tangerine), start with slightly less.
Prep for zest-like texture: grate zest very finely with a microplane, or reduce juice until it tastes more concentrated and less watery.
Taste-adjust: add a small pinch of salt to sharpen, or a micro-splash more lime to regain tang.
Use promptly in cooked mixtures (especially dairy and eggs) to preserve bright aroma.
