Cream the butter and sugar until light and fluffy. Mash the bananas and add it the butter and sugar mixture. Add the salt, cinnamon, lemon juice, and egg. Fold in the flour and baking powder and por the batter into a greased 9x5 loaf pan. Bake at 350 F for about 1 hour or until cake tester comes out clean. Slice and top with honey, jelly, or ice cream.