01 - Combine chili peppers, garlic, red bell pepper, onion, olive oil, red wine vinegar, lemon juice, smoked paprika, oregano, salt, black pepper, and sugar in a blender or food processor. Blend until a smooth marinade forms.
02 - Pat chicken pieces dry. Place in a large bowl or resealable bag, pour over the marinade, and ensure all pieces are coated. Cover and refrigerate for at least 3 hours or preferably overnight.
03 - Preheat grill to medium-high heat or set oven to 400°F (200°C).
04 - Grill chicken over indirect heat, turning occasionally and basting with reserved marinade, for 35 to 40 minutes until skin is crisp and meat is cooked through. For oven preparation, arrange chicken on a rack over a baking tray and roast for 40 minutes, turning once halfway through.
05 - Allow chicken to rest for 5 minutes before serving. Top with chopped coriander or parsley and accompany with lemon wedges.