Combine 3 cups rhubarb, finely chopped, juice of 3 small oranges (or 1 large one), rind of 2 oranges (2 teaspoons orange rind), 2 heaping tablespoons flour, 2 eggs and 1 1/2 cups sugar. Mix well. Pour into pie shell and cover with top crust. Bake in 400 degree oven for 40 to 50 minutes until rhubarb is done and crust nicely browned.