Creating Authentic Jamaican Jerk Chicken is a straightforward process if you follow these steps:

1. Prepare the Marinade: In a blender or food processor, combine allspice berries, black pepper, dried thyme, cinnamon, nutmeg, Scotch bonnet peppers, onion, garlic, green onions, ginger, soy sauce, olive oil, brown sugar, lime juice, and salt. Blend until smooth.
2. Marinate the Chicken: Place the chicken thighs and drumsticks in a large bowl or resealable plastic bag. Pour the marinade over the chicken, ensuring it is well-coated. Seal the bag or cover the bowl and refrigerate for at least 2 hours, ideally overnight.
3. Preheat the Grill: Preheat your grill to medium-high heat (about 400°F or 200°C). If using charcoal, allow the coals to burn down until they are covered with white ash.
4. Prepare the Grill Grates: Lightly oil the grill grates to prevent sticking.
5. Grill the Chicken: Remove the chicken from the marinade, letting any excess drip off. Place the chicken on the grill, skin-side down. Grill for 6-8 minutes per side, or until the chicken is cooked through and has nice grill marks. The internal temperature should reach 165°F (75°C).
6. Baste with Marinade: During the last few minutes of cooking, you can baste the chicken with any leftover marinade for extra flavor.
7. Rest the Chicken: Once cooked, remove the chicken from the grill and let it rest for about 5 minutes before serving. This allows the juices to redistribute.
8. Serve: Pair the grilled chicken with your favorite sides, such as rice and peas or a fresh salad.

This simple yet flavorful approach will give you perfectly grilled Authentic Jamaican Jerk Chicken every time.