Smear Rib Rub on the meaty side of the 4 racks until coated. Place the ribs on a cookie sheet, cover with foil, and bake at 350 degrees for 3 hours.
Remove and set aside. When your fire is ready grill the ribs for 2 more minutes on each side to get a little char going. then brush the meaty side generously with bbq sauce. Keep flipping, a minute or so on each side, being careful not to burn but getting nice and caramelized. Cover and cook for 5 minutes. Remove from the heat, and slice the ribs along the bones on a cutting board.
combine all ingredients in a small saucepan over medium heat. Cook for 7 to 8 minutes, until thickened. Remove from the heat and let cool.