1. In a medium nonstick skillet, heat oil,; add pork & onions. Cook over medium -high heat, stirring frequently, 5 minutes, until onions are golden brown.
2. Add apple to pork mixture; stir to combine.
3. In a small bowl, with wire whisk, combine broth, cider, vinegar, cornstarch, sage, thyme and pepper, blending until cornstarch is dissolved; stir into pork mixture. Continuing to stir, bring liquid to a boil. Reduce heat to low; simmer, covered, 10 minutes, until pork is cooked through and mixture is slightly thickened.