In a large bowl, combine allspice, thyme, cayenne pepper, black pepper, sage, nutmeg, cinnamon, salt garlic, and sugar.
Slowly whisk in the oil, soy sauce, vinegar, orange juice, and lime juice until all ingredients are blended.
Add the scotch bonnet pepper and onions. Mix well. (Be careful handling the peppers – use gloves)
Add the chicken breast. Using a spoon or gloved hands, coat the chicken with sauce. Cover the bowl and transfer to the refrigerator. Marinate overnight or a minimum of 1 hour.