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 the mixture is smooth.
02 - Pat chicken pieces dry. Place chicken in a large bowl or resealable plastic bag. Add the marinade and coat thoroughly. Cover and refrigerate for at least 3 hours, or preferably overnight for maximum flavor.
03 - Preheat grill to medium-high heat, or preheat oven to 400°F.
04 - Grill chicken over indirect heat, turning every few minutes and basting with reserved marinade, for 35–40 minutes until fully cooked and skin is crisp. For oven roasting, place chicken on a rack over a baking tray and cook for 40 minutes, turning halfway through.
05 - Let chicken rest for 5 minutes. Garnish with chopped coriander or parsley and serve with lemon wedges.