Heat oven to 325°F. Place ribs in ungreased 13x9-inch pan. Brush ribs with liquid smoke; sprinkle with peppered seasoned salt. Cover with foil. Bake at 325°F. for 1 1/2 hours.
Meanwhile, in small saucepan, combine barbecue sauce, jelly and mustard; mix well. Heat over low heat until hot, stirring occasionally.
Remove ribs from oven. Uncover; drain and discard liquid. Brush ribs well with sauce mixture. Return to oven; bake an additional 30 minutes, brushing frequently with sauce.
To serve, carefully cut ribs into individual bones and arrange on platter. Serve with any remaining sauce.