Chicken: In a medium size bowl, combine the BBQ sauce, sugar, pepper, seasoned salt and vinegar. Whisk until combined. Place chicken in a resealable plastic bag and add sauce. Seal bag and refrigerate overnight.
When ready to cook; Heat charcoal or gas grill to medium-low heat. Heat oven to 375°. Grill chicken over medium-low heat for 45 minutes, or until meat registers 170°.
Brown Rice: In a medium size baking dish, combine beef broth, consomme, rice, onion and butter. Bake at 375° for 45 minutes. Allow chicken and rice to rest 5 minutes before serving.