Rub pork with thyme. In a large skillet, brown pork in 1-1/2 teaspoons butter; remove and set aside. In the same skillet, saute onion in remaining butter until tender. Stir in apple; cook and stir for 2 minutes. Add 1-1/2 teaspoons apple juice or brandy; cook and stir 30 seconds longer. Transfer to a bowl.
Add wine or broth and remaining apple juice or brandy to the skillet. Bring to a boil over medium heat; cook for 5 minutes or until liquid is reduced by half. Stir in broth, pork and apple mixture. Bring to a boil. Reduce heat; simmer, uncovered, for 20 minutes or until a thermometer reads 160°, turning pork occasionally. Remove pork and keep warm.
In a small bowl, combine the cornstarch, salt and pepper; gradually stir in cream and mustard. Stir into apple mixture. Bring to a boil; cook and stir for 2 minutes or until thickened. Serve with pork.