Choose the closest match: coconut aminos for flavor similarity, tamari for deeper salt umami, or fish sauce diluted for emergencies.
Use the listed ratio first; for tamari and fish sauce, start slightly low (¾:1 or ¼:1) to avoid oversalting.
Adjust balance: if it tastes flat, add 1–2 teaspoons of rice vinegar or lemon juice; if it’s too sharp, add a small pinch of sugar.
In stir-fries and marinades, add the substitute early enough to coat, then simmer 1–2 minutes so it melds.
Taste at the end and correct salt/sweet/acid so the swap matches the original dish goal (savory balance vs. glaze).