01 - In a blender or food processor, combine the fresh red chili peppers, garlic cloves, chopped red onion, lemon juice, apple cider vinegar, olive oil, smoked paprika, dried oregano, coarse sea salt, black pepper, and brown sugar. Blend until a smooth, vibrant paste forms.
02 - Place the chicken thighs and drumsticks in a large mixing bowl or a resealable plastic bag. Pour the marinade over the chicken pieces, ensuring each piece is thoroughly and evenly coated. Seal tightly and refrigerate for a minimum of 2 hours; overnight marinating yields the best flavor penetration.
03 - Preheat the oven to 400°F or prepare an outdoor grill for medium-high heat, ensuring the grates are clean and lightly oiled.
04 - Remove the chicken from the marinade, allowing any excess to drip off. Reserve a small portion of the marinade for basting during cooking. Arrange the chicken pieces on a foil-lined baking sheet or directly onto the preheated grill grates.
05 - Cook the chicken for 35 to 40 minutes, turning and basting once or twice with the reserved marinade. The chicken is done when the internal temperature reaches 165°F, the juices run clear, and the skin is crispy with a slight char.
06 - Transfer the cooked chicken to a platter and allow it to rest for 5 minutes so the juices redistribute. Garnish generously with freshly chopped cilantro or parsley and serve alongside lemon wedges.