Rhubarb Pie

1 unbaked pie shell

Mix together:

6 cups rhubarb

1 3/4 c. sugar

1/2 c. flour

3 T. butter

Heat oven to 425 degrees.  Put rhubarb mixture in pie shell.  Dot butter on top of rhubarb.  Put top crust on.  Put foil on edges.  Bake for 40-50 minutes.  Take foil off the last 15 minutes.