Prepare the ingredients. Mince the ginger and garlic, and freshly squeeze the lime juice.
Mix. In a medium mixing bowl, combine the fish sauce, water, sugar, lime juice, ginger, garlic, and garlic chili paste, stirring until the sugar is dissolved. For added heat, add chopped Thai chilis.
Serve or store. Serve this sauce immediately or store it in an airtight container in the refrigerator for up to 1 week.