Lenny'S Favorite Banana Cake
["1 1/2 c. sugar", "1/2 c. shortening", "1 egg", "1 egg yolk", "2 c. cake flour", "1 tsp. baking powder", "1 tsp. baking soda", "1/2 tsp. salt", "1 c. mashed bananas (4 bananas)", "3/4 c. sour milk or buttermilk", "1 tsp. vanilla"]
["Cream shortening and sugar; add egg and egg yolk.", "Add sifted flour, baking powder, baking soda and salt.", "Add bananas, sour milk and vanilla.", "Bake in a 9 x 13-inch pan at 375\u00b0 for 1/2 hour."]
["sugar", "shortening", "egg", "egg yolk", "cake flour", "baking powder", "baking soda", "salt", "bananas", "sour milk", "vanilla"]