Banana Cake With Rum Icing with buttermilk

1/4 cup soft margarine 3/4 cup granulated sugar 2 eggs 1 teaspoon vanilla extract 1 cup mashed ripe banana (about 3) 1 teaspoon orange rind 2 cups all-purpose[...]

2 cups flour 1 1/2 teaspoons baking powder 1 teaspoon baking soda 1/2 teaspoon salt 1 1/2 cups sugar 1/2 cup margarine 1/4 cup buttermilk or 1/4 cup sour milk[...]

1 1/2 cups sugar 2 eggs 1 cup mashed, ripe banana 2 1/2 cups flour 1 teaspoon baking powder 1/2 cup shortening 1 cup sour milk or 1 cup buttermilk 2 teaspoons[...]