Heat the oil in a sauté pan over medium heat. Add the garlic and jalapeños and sauté until the garlic just starts to color—about 1½ minutes. Add the allspice, cinnamon, cayenne and brown sugar and cook, stirring constantly, until the sugar melts and the mixture starts to clump. Remove from the heat.
Transfer the mixture to a blender. Add the white pepper, thyme, salt, ginger, scallions, lime juice and vinegar, and blend until smooth.
Coat the pork belly with jerk mixture, place in a covered pan and cook in a preheated oven at 450° for about 45 minutes. Allow the pork belly to cool, then cut into portions and panfry until crispy on both sides. Serve with collards and enjoy.