First; Preheat the oven to 450 degrees fahrenheit.

Second; Combine sugar and flour. Sprinkle 1/4 of it over the pastry in pie plate, heap rhubarb over this mixture, and sprinkle with remaining sugar and flour. Put small pieces of butter then cover with top crust.

Third; Place the pie on lower rack in oven. Bake it for 15 minutes and reduce oven temperature to 350 degrees fahrenheit then continue baking for 40 to 45 minutes. You can serve it warm or cold, either or.