Combine rhubarb, 1 tablespoon flour and white sugar. Mix well and place in pie shell. Melt the butter or margarine and mix with 1/2 cup brown sugar, crushed corn flakes and 1/2 cup flour. Mix in a bowl and pat down on top of pie. Bake in oven at 350 degrees F (175 degrees C) for about 40 minutes. Turn off oven and leave the pie in the oven for another hour. Serve warm. Nutrition at a glance Servings Per Recipe: 8 amount per serving: Calories 314 : Protein 3g, Total Fat 13.4g, Sodium 183mg, Cholesterol 16mg, Carbohydrates 46.6g, Fiber 2g Makes 1 - 9 inch pie Per Serving (excluding unknown items): 146 Calories; 6g Fat (35.8% calories from fat); 1g Protein; 23g Carbohydrate; 1g Dietary Fiber; 16mg Cholesterol; 66mg Sodium. Exchanges : 1/2 Grain(Starch); 0 Fruit; 1 Fat; 1 Other Carbohydrates.