1.Melt Butter In A Large Skillet Over Medium Heat. Saute Onions Until Tender. Stir In Brown Sugar, Ketchup, Vinegar, Mustard, Worcestershire Sauce And Pepper Sauce. Simmer, Stirring Occasionally, For 20 Minutes. 2.Place Sausage In A Slow Cooker With The Sauce And Onions. Cook On Low For 4 To 5 Hours. The Longer It Simmers The Better!