Line a 9 inch pie plate with bottom pastry. Sprinkle coconut over bottom of pastry shell.
In a large heavy bottom saucepan, stir together crushed pineapple, sugar, flour, lemon juice, and butter. Cook until mixture begins to thicken. Cool to room temperature. Pour into bottom pastry.
Pre heat oven to 400. Roll out top pastry and cut slits (or stars) into the pie crust. Lie over top of bottom pastry and trim and flute edges. Cover crust of dough with aluminum foil or pie guard.
Bake for 30 minutes. Remove foil/guard and continue to bake another 10 minutes, until crust is browned. Cool completely.