Step 1

Preheat oven to 275 degrees F (135 degrees C). Grease and flour a 9x13 inch pan. In a small bowl, mix mashed bananas with lemon juice, set aside. In a medium bowl, mix flour, baking soda and salt. Set aside.

Step 2

In a large bowl, cream 3/4 cup butter and 2 1/8 cups sugar until light and fluffy. Beat in the eggs one at a time, then stir in 2 teaspoons vanilla. Beat in the flour mixture alternately with the buttermilk. Stir in banana mixture. Pour batter into prepared pan.

Step 3

Bake in preheated oven for 1 hour, or until a toothpick inserted into the center of the cake comes out clean. Remove from oven and place directly into freezer for 45 minutes. This will make the cake very moist.

Step 4

For the frosting: In a large bowl, cream 1/2 cup butter and cream cheese until smooth. Beat in 1 teaspoon vanilla. Add confectioners sugar and beat on low speed until combined, then on high until frosting is smooth. Spread on cooled cake.