Pour The Barbeque Sauce Into A Medium Bowl. Crumble The Tempeh Into The Sauce, And Let It Marinate A Little, About 10 Minutes. Heat Oil In A Skillet Over Medium Heat. Add The Red And Green Peppers, And The Onion. Cook, Stirring Frequently Until Tender. Stir In The Tempeh And Barbeque Sauce, And Heat Through. Spoon The Tempeh Mixture Onto Kaiser Rolls, And Serve.