Granny Smith's Pork

1 pound boneless pork leg, cut into 1/2-inch cubes
2 tablespoons vegetable oil
4 Granny Smith apples, cored and sliced into 1/2-inch wedges
1 cup dry white wine or chicken broth
1/2 cup brown sugar
1/4 cup cider vinegar
3 tablespoons cornstarch
2 tablespoons Worcestershire sauce
1/2 teaspoon salt
1/4 teaspoon black pepper

Heat oil over medium heat in a large skillet. Add pork and brown on all sides. Add apple slices. Saut