Identify your chili sauce style: sweeter (sweet chili sauce), garlic-forward (chili garlic sauce), or smoky-spiced (harissa).
Start with the listed ratio; in stir-fries/marinades, thin with 1–2 teaspoons water so it coats evenly.
Adjust heat first (add chili flakes or extra chili paste in small pinches), then balance tang (vinegar/lemon) and sweetness (sugar/honey).
If the substitute is grainy or very thick, simmer it with a splash of water for 30–60 seconds to smooth the texture.
Taste after 2 minutes of cooking and fine-tune: add salt/soy for depth, or add a touch of sugar to reduce sharp vinegar notes.