Carolina Style BBQ Pork (AIP, Paleo, GAPS, SCD)

Name: Carolina Style BBQ Pork (AIP, Paleo, GAPS, SCD)
Cuisine: American
Ingredients: 2 tablespoons coconut sugar; 1 teaspoon onion powder; 1 teaspoon garlic power; 1 teaspoon sea salt; 1 teaspoon cinnamon; 2 tablespoons coconut oil, or fat of choice; 1 (3-5 lb.) pork shoulder roast or Boston Butt (with fat cap removed); 1 onion, thinly sliced; ½ cup apple cider vinegar; 2 tablespoons maple syrup (or honey); 3 tablespoons stone ground mustard (omit for strict AIP); 2 tablespoons coconut aminos; 2 cloves garlic, minced or pressed