Make sour milk: combine 5 tablespoons milk with 3/4 teaspoon lemon juice and microwave for 1 minute
Thoroughly cream sugar and shortening
Add eggs and mix well
Sift together flour and salt
Mix together sour milk, baking soda, mashed bananas, and vanilla extra
Add wet and dry ingredients to mixer, alternating dry, wet, dry, wet, dry
Add nuts if using
Mix well then pour into prepared loaf pan
Bake at 350 for 45 minutes for 3 small loaves or 1 hour for one large loaf