Rhubarb Cake
["1/2 c. butter", "1 1/2 c. brown sugar, packed", "1 egg", "1 tsp. vanilla", "1 c. buttermilk", "1 tsp. soda", "2 c. flour", "1 1/2 c. rhubarb, coarsely chopped"]
["Beat butter, sugar, egg and vanilla until creamy.", "Stir soda into buttermilk; add to sugar mixture alternating with flour. Stir in rhubarb.", "Spread in greased and floured 9 x 13-inch pan. In small bowl, combine 1/2 cup sugar, 1 teaspoon cinnamon and 1 tablespoon melted butter.", "Sprinkle over batter.", "Bake at 350\u00b0 for 40 minutes."]
["butter", "brown sugar", "egg", "vanilla", "buttermilk", "soda", "flour", "rhubarb"]