Rhubarb Oat Mixture
["1 1/2 c. flour", "1 1/2 c. old fashioned oatmeal", "1 c. packed brown sugar", "1/2 c. chopped walnuts", "1/4 tsp. baking soda", "1/4 tsp. salt", "1 c. cold butter or margarine", "3 to 4 c. fresh or frozen rhubarb", "1 1/4 c. cold water", "1 1/2 c. white sugar", "3 Tbsp. cornstarch", "1 tsp. vanilla", "1/2 tsp. red food coloring (optional)"]
["Combine flour, oatmeal, brown sugar, walnuts, baking soda and salt. Mix. Cut in cold butter or margarine. Press 3 cups mixture in ungreased 13 x 9 x 2-inch pan. Soak rhubarb in 1 cup cold water for 3 minutes. Drain."]
["flour", "oatmeal", "brown sugar", "walnuts", "baking soda", "salt", "cold butter", "frozen rhubarb", "cold water", "white sugar", "cornstarch", "vanilla", "red food coloring"]