Peel, core and quarter apples. Half each quarter crosswise to get chunks. Put in large bowl and combine with the sugar, cinnamon, nutmeg and flour. Sprinkle over the apples and toss mixture. Place apples in pastry shell and sprinkle with lemon juice. Combine the sugar and flour for the topping and cut in the margarine. Sprinkle over the apple mixture. Slide the entire pie into a heavy brown paper bag (regular bag used at grocery stores) to cover loosely. Fold open end over twice and fasten shut with 2 paper clips. Place on large cookie sheet and bake at 220ºC or 1 hour. Split paper bag open, remove pie, cool and serve