In a food processor, combine peppers, garlic, oil, vinegar, rosemary and red pepper flakes. Pulse until mixture is almost smooth; set aside. Place a double layer of foil on a rimmed baking sheet. Place ribs on top of foil; season generously with salt and pepper. Pour pepper-oil mixture over both sides of ribs; wrap ribs tightly with 1 layer of foil. Place baking sheet in a preheated 250° oven; cook until meat is tender but not quite falling off the bone (a paring knife should slide easily into the flesh after 2 ½-3 hrs.). Remove from oven and let rest for 10 min.; remove foil from ribs, carefully reserving juices. Place ribs on a clean rimmed baking sheet; broil under a preheated broiler until dark golden and slightly charred on the edges (8-10 min.). Remove ribs from oven; let rest for 10 min. Slice into individual ribs; drizzle with reserved juices and top with parsley. Serve with lemon wedges.