Blend until creamy:
1/3 cup vegetable shortening (such as Crisco)
1⁄2 cup sugar
3⁄4 teaspoon finely grated lemon zest
1 egg, lightly beaten
Sift before measuring:
13⁄4 cups flour
11⁄2 teaspoons baking powder
1⁄4 teaspoon baking soda
Mash 2 or 3 ripe banans to make:
1 cup banana pulp
Add the sifted ingredients in 3 parts to the sugar mixture alternately with the banana pulp. Beat the batter after each addition until smooth. Scrape into a buttered loaf pan, about 9 x 5 x 3 inches. Spread smooth.
1⁄2 cup chopped walnuts
Bake at 350 degrees until brown on top and done in the center (poke with a toothpick; it should come out clean), about 50-55 minutes.
Adapted from The Joy of Cooking