Roll the
pie crust thin and use it to cover the bottom and up
the sides of a 9" spring form pan. Press firmly
against sides of the pan to press out wrinkles. Cook
the sausage and brown the onion with it. Drain. Stir
in celery and spread sausage. Blend together the
cream cheese, eggs, milk and sour cream. Pour over
the sausage. Cover top with tomato slices. bake in a
325 degree oven about 45 to 50 minutes or until the
top in uniformly brown. Remove from the oven and
allow to cool about 15 minutes before removing the
outer rim of the pan and serving.