2   cups       flour
2   teasponns  baking powder
3/4 teaspoon   salt
1/2 teaspoon   baking soda
1   cup        sugar
1/2 cup        shortening
2              eggs
1   cup        mashed banana
1   teaspoon   lemon juice
1   cup        chopped walnuts

Sift together flour, baking powder, salt, baking soda, and sugar into a bowl.  
Add shortening, eggs, and 1/2 cup of banana.  
Stir, then beat for 2 minutes.
Add the remaining 1/2 cup of banana and lemon juice.
Beat 2 more minutes.
Fold in nuts.
Pour into greased and floured loaf pan (you can use 1 large loaf pan, 
    but I find they bake more evenly if you divide it into 4 small loaf pans).
Bake at 350 degrees for 1 hour 15 minutes (if it is in a large loaf pan) 
     or about 40 minutes (if it is in small loaf pans).