Pound pork slices with a meat mallet to 1/2-in. thickness. In a large skillet, heat 1 tablespoon butter over medium heat. Brown pork on each side. Remove pork from pan, reserving drippings., Add preserves, green onions, vinegar, mustard and remaining butter to pan; bring just to a boil, stirring to loosen browned bits from pan. Reduce heat; simmer, covered, 3-4 minutes to allow flavors to blend., Return pork to pan; cook until pork is tender. Let stand 5 minutes before serving.