Preheat grill over medium-high heat and brush with olive oil. Season chops with salt and pepper on both sides. Place pork on grill for 8-9 min., turning once halfway through, until internal temperature is 145°F as measured by a meat thermometer. Remove pork from grill, tent with foil and rest for 3 min., before serving.
Spicy BBQ Sauce: Heat oil in pot over medium heat. Sauté onion until soft; add ketchup, brown sugar, Worcestershire sauce, vinegar and cayenne. Simmer for 15 min., until sauce thickens; turn off heat. Once cooled, purée sauce in blender.