Arrange the chicken quarters - skin side up and side by side - on the grill grate. Broil for 15 minutes. Turn the chicken quarters over and broil for 15 minutes. Brush the quarters with some of the glaze. Allow the sauce to caramelize on this side. Turn the quarters over. Brush and caramelize that side. Turn the quarters over. Brush and caramelize that side. Turn over. Brush and caramelize. Remove the quarters from the broiler and season with salt and black pepper. Allow the chicken to rest for 5-10 minutes. Serve with caramelized onions, warm flour tortillas and hot sauce.