For the infusion:
For the peppers:
To finish
Place peppers/salt/sugar on a paper towel for ~2 hours to remove some of the excess moisture. Transfer to a heat-resistant container with room for the oil.
Place infusion ingredients in a sauce pan over medium heat. Heat until the aromatics become fragrance and the oil shimmers (~240°F). Remove from heat and immediately pour through strainer over the peppers. They may sizzle and pop. Stir gently and allow to cool below 100°F.
Add finishing ingredients and transfer to an airtight container. Store in refrigerator up to 3 months.
For a less Chinese, more Southeast Asian style, change the infusion to simply garlic and oil. Change the finishing ingredients to paprika, sesame seeds, sesame oil, and 1 tsp. fish sauce (no vinegar or soy).
For brighter color and more depth of flavor, omit the paprika and add 2 Tbsp. gochugaru or Chinese pepper flakes to the pepper mixture.
If you have dried peppers instead of fresh, use about 1/3 c. dried thai peppers. Remove seeds as you would with fresh.
If you don't have chinkiang, substitute 1/3 part balsamic:2/3 part rice wine vinegar. Chinkiang is available at Asian markets (e.g YZ Mart) and online.