1. In bowl stir together Kellogg's® Club Original crackers, hoisin sauce, five-spice powder and cayenne pepper. Add ground beef. Mix well. Shape into four 1/2-inch-thick patties. Brush pineapple and onion slices on both sides with oil.
2. Grill burgers directly over medium heat for 12 to 16 minutes or until no longer pink (165° F), turning once. Add pineapple slices and red onion slices to grill alongside burgers for the last 5 to 7 minutes of grilling or until beginning to brown, turning once.
3. Serve burgers in buns along with pineapple and onion slices.