01 -
Remove stems from chilies. Coarsely chop the bell pepper, chilies, onion, and garlic.
02 -
Place chopped bell pepper, chilies, onion, garlic, and 2 cups water in a blender or food processor. Pulse several times until finely chopped but not pureed.
03 -
Pour the blended mixture into a saucepan. Add sugar, salt, and vinegar. Stir thoroughly, bring to a simmer over medium heat, and cook until the sugar and salt are completely dissolved.
04 -
Dissolve the potato starch or cornstarch in 2 tablespoons of water. Pour this slurry into the simmering sauce while stirring continuously. Cook on low heat until the sauce thickens slightly.
05 -
Remove the saucepan from heat. Allow the sauce to cool completely—it will continue to thicken as it cools. Transfer to a sterilized jar, seal, and refrigerate for up to 4 weeks.
06 -
Serve as a dip for fried, grilled, or roasted dishes, or use as a flavorful condiment.