2 1/2 c. sifted flour
1 tsp. baking soda
1 tsp. salt
1 1/2 c. brown sugar, firmly packed
1 egg, beaten
2/3 c. cooking oil
1 c. sour milk or buttermilk
1 tsp. vanilla
1 1/2 c. finely diced fresh rhubarb
1/2 c. chopped walnuts
1/2 c. sugar
1 tbsp. melted butter
1/2 tsp. ground cinnamon

Sift flour, baking soda, and salt together in bowl. Mix in brown sugar. Combine egg, oil, sour milk (or buttermilk), and vanilla. Add to dry ingredients; blend well. Stir in rhubarb and walnuts. Spread batter in greased 9 inch square baking pan. Combine sugar, butter and cinnamon; mix well. Sprinkle over batter. Bake in 325 degree oven for 55 minutes or until done.