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 and blend until smooth.
02 - Pat chicken pieces dry. Place them in a large bowl or resealable plastic bag, pour in the marinade, and coat thoroughly. Cover and refrigerate for at least 3 hours or overnight for optimal flavor.
03 - Preheat grill to medium-high heat or preheat oven to 400°F.
04 - Grill chicken over indirect heat, turning occasionally and basting with reserved marinade, for 35 to 40 minutes until cooked through and skin is crisp. If using the oven, arrange chicken on a rack over a baking tray and roast for 40 minutes, turning halfway through.
05 - Allow chicken to rest for 5 minutes. Garnish with chopped coriander or parsley and serve with lemon wedges.