In a large bowl cream shortening and sugar, add eggs one at a time, add vanilla, banana, and lemon juice.
In a medium bowl sift together flour, baking soda, and salt. Add flour mixture to banana mixture in three additions beat until just combine.
Pour batter into a greased and floured 9" by 5" metal loaf pan and until a toothpick inserted comes out clean about 50-55 minutes. Cool for 10 minutes in pan, remove from pan and cool completely on a wire rack.