How to Make It
Heat oil, chiles, and garlic in a small saucepan over low until warmed, about 5 minutes. Remove from heat. Let stand at room temperature until desired degree of spiciness, from 20 minutes to 2 hours. (Taste oil for spiciness after 20 minutes.) Pour oil through a fine wire-mesh strainer into a small bowl; discard solids.
Add lime juice, soy sauce, brown sugar, fish sauce, ginger, and salt to strained oil; whisk to combine.