Spray a 9 x 33 cm pan with pan coating. Mix dry Jello with cake mix. Add the other ingredients except confectioner's sugar and lemon juice and beat into a smooth batter. Pour into prepared pan and bake at 0ºC . for 25 minutes or until a toothpick inserted in the center comes out clean. Allow to cool for five minutes while mixing together the confectioner's sugar and lemon juice. Prick the cake all over with a fork and pour the icing over the top. To serve, cut in squares and top with whipped topping.
Use yellow cake mix. Three cups of homemade cake mix can be substituted for 1 package of commercial cake mix.