Identify your recipe need: thick stir-in heat (best) vs smoky-spice depth vs sweet-fermented flavor.
Start with the recommended ratio from the table (or reduce by 25% for sweet pastes like gochujang/harissa).
If using a liquid substitute, simmer 30–60 seconds with chili flakes or a spoon of sauce so it clings to food.
Adjust in small increments: add vinegar for tang, salt for savoriness, and a pinch of sugar only if the swap tastes harsh.
Taste after cooking—chili pastes mellow, so judge heat at the end, not the start.