Cream together: ½ cup butter 1 ½ cup sugar Beat in: 1 egg 1 tsp vanilla Sift together: 2 cups flour 1 tsp soda ½ tsp salt Add sifted ingredients alternately with: 1 cup milk or cream & 1 Tbsp vinegar Mix cake batter & add: 2 cups chopped rhubarb Tossed with 1 tbsp flour. Pour into greased 9x13 pan. Sprinkle with topping. Topping: ¼ cup butter 2 tsp cinnamon 1 cup brown sugar Bake 45 min @ 350.