Spatchcocked Jerk Chicken (Oven-Roasted)

Name: Spatchcocked Jerk Chicken (Oven-Roasted)
Prep time: 20 min
Cook time: 2 h 10 min
Total time: 2 h 30 min
Cuisine: Caribbean
Ingredients: 5-6 pounds whole chicken spatchcocked; 1/4 cup white distilled vinegar; 4 cups cool tap water (enough to cover the chicken); 2 tablespoons custom seasoning blend; 2 tablespoons all-purpose seasoning; 1 teaspoon pink Himalayan salt (or to taste); 2 teaspoons fresh cracked black pepper (or to taste); 12 whole pimento seeds (allspice berries), 6 crushed, 6 whole; 3 tablespoons jerk seasoning; 3 stalks scallion, chopped up; 12 sprigs fresh thyme; 3 cloves fresh garlic, (chopped); 2 tablespoons soy sauce; 2 teaspoon liquid smoke (optional); 1 cup Red Stripe Beer ( or any lager beer)