In a large bowl, combine flour and salt; cut in shortening until crumbly. Gradually add cold water, tossing with a fork until a ball forms.
Roll out pastry to fit a 9-in. pie plate; flute edges. Toss apples with sugar and cinnamon; pour into crust. Bake at 375° for 20 minutes.
Meanwhile, in a small bowl, combine the first four topping ingredients. Stir in the egg, butter and vanilla until smooth. Add coconut. Spoon over hot apples, carefully spreading to cover. Bake 30 minutes longer or until apples are tender.