In top of double boiler or in a heavy pan, mix together: salt, cornstarch and cold water. Cook in pan or double boiler on medium heat until mixture thickens and becomes transparent. Remove from heat and add sugar and vanilla to cornstarch mixture.

Stir and pour evenly over the apples. Sprinkle the reserved crust mixture over all.

Optional: A few chopped walnuts or pecans can be sprinkled over top as well.

Bake for 40 to 50 minutes at 350°F. Serve warm from oven, plain or with whipped cream or ice cream. Keeps well, but softens somewhat on standing.