Preheat grill to medium/low (300˚F). Place mini peppers in a large mixing bowl, drizzle with ½ Tbsp olive oil and toss to combine. Place peppers on preheated grill and cook 2 min per side (5-6 min total), or just until light grill marks are appear on peppers. Transfer to a bowl.
For the marinade, mix together 1 cup water, 1¼ cup vinegar, 6 pressed garlic cloves, 6 Tbsp of sugar, & 2 Tbsp of salt. Stir until sugar dissolves.
Place ½ of the parsley, ½ of the dill on the bottom of a ½ gallon jar. Tightly fill with peppers. Pour marinade over peppers and add remaining herbs. Cover and marinate overnight in the refrigerator before serving.*
