Bring to simmer, reduce heat to low and cook uncovered for 30 to 45 minutes on low heat until sauce thickens and becomes glossy. Stir occasionally. Serve with sauce on the side.
Slow Cooker Method
Combine ingredients in slow cooker vessel. Cook covered on high setting for 2 hours, then uncover and cook another hour or until sauce thickens and becomes glossy. Stir occasionally. Serve with sauce on the side.