Stuffed Pork with apples

1 each onion minced 2 each granny smith apples peeled, chopped 1/2 pound sausage meat bulk pork sausage, uncooked * 4 each celery stalks chopped 3 tablespoons[...]

2 medium apples coarsely chopped 7 tablespoons butter, unsalted 3 tablespoons brown sugar, light 1 teaspoon vanilla extract 1/2 teaspoon nutmeg ground[...]