Pierce a hook through the thick end of the meat about 3 inches down from the end. Hang in the cooker, and close the lid.
Remove the barrel from the base of the cooker and set aside. Place the open frame over the coals in the base of the cooker and add the half grates. Let heat for a couple of minutes. Add the tri-tip to the grill. Grill directly on the grates about 3-5 minutes per side.
Remove. Let rest 10 minutes. Slice and serve.