Smoky Chicken Barbecue Kabobs Recipe courtesy of Grill Nation by David Guas Serves 8 Ingredients: 4 skinned and boned chicken breasts (about 2 lb.) ½ large red onion, cut into fourths and separated into pieces 1 pt. cherry tomatoes 8 (8-inch) metal skewers Smoky-Sweet BBQ Rub ¼ cup kosher salt ¼ cup firmly packed dark…