2Combine sugar and flour. Sprinkle 1/4 of it over pastry in pie plate. Heap rhubarb over this mixture. Sprinkle with remaining sugar and flour. Dot with small pieces of butter. Cover with top crust.
3Place pie on lowest rack in oven. Bake for 15 minutes. Reduce oven temperature to 350 degrees F (175 degrees C), and continue baking for 40 to 45 minutes. Serve warm or cold.
Footnotes
Tip
Aluminum foil can be used to keep food moist, cook it evenly, and make clean-up easier.