Add the oil to a small saucepan over medium-low heat and heat through. Add the white sesame seeds, black sesame seeds and garlic and cook, stirring occasionally, until the garlic and white sesame seeds are a light pale golden color (not get fully golden brown), about 6 minutes.
Add the chilies and continue to cook until just fragrant and the garlic is golden brown, about 2 additional minutes (they will continue cooking as the oil cools).
Remove from heat and let cool for 10 minutes.
Add to a blender or food processor fitted with the blade attachment with vinegar and pulse until the chilies are finely chopped but not smooth.
Pour into a bowl or container and season to taste with salt.
Store, refrigerated in an airtight container for up to a month.