Using your hands, mix the chorizo, rice, breadcrumbs, pepper, onion, cilantro and salt and pepper (if desired) in a large bowl. Dividing into 10 portions and roll into balls.
In a small saucepan over medium low heat, mix the barbecue sauce and brown sugar until heated.
Place on a greased baking dish and bake for 25 to 30 minutes, until cooked through, basting once or twice with some of the barbecue sauce.
Remove from oven and serve with remaining barbecue sauce poured over top.