Prepare your favorite crust for a filled 1-crust pie.
Preheat oven to 350 degrees. In a medium saucepan, combine sugar,
cocoa and flour; add butter and milk. Cook until mixture begins to
boil, stirring constantly. Remove from heat.
Add small amount of hot mixture to eggs, mix well, then fold egg
mixture into the chocolate mixture.
Fold 1/3 of the pie filling into chocolate mixture; save the rest
for the topping. Pour chocolate mixture into pie crust.
Bake at 350 degrees for 35-45 minutes or until center is set but
still shiny. Cool, and chill one hour.
Whip the cream. Combine 2 cups whipped cream and grated chocolate
and spread over cooked pie. Top with remaining pie filling, and the
remaining whipped cream. Chill at least half an hour before serving.