In a mortar, mash the chilies, garlic, cilantro and mint into a coarse paste using the pestle.
Add the fish sauce, lime juice and sugar. Grind well with the pestle until combined and sugar dissolves.
Transfer to a bowl or jar. Let sit for 30 mins for flavors to develop.
Authentic homemade Thai green chili sauce recipe made with fresh chilies, herbs, and classic Thai flavors!