Butterscotch Banana Cake 

3/4 cup shortening
1 tsp. soda
2 1/4 cup sugar
1 tsp. baking powder
1 1/2 tsp. vanilla
3/4 tsp. salt
Grated rind of 1 lemon
1/3 cup buttermilk
1 1/2 cups mashed bananas
3 cups cake flour 

Cream shortening; add sugar gradually, beating until light. Add vanilla and lemon rind, then eggs, one at a time, beating thoroughly after each.

Butterscotch filling: 

3 tbsp. butter
1/4 cup flour
1/2 cup brown sugar, packed
1/2 tsp. salt
1 1/2 cups milk
1 egg, beaten
1/2 tsp. vanilla 

Melt butter. Add sugar and cook 2 minutes in top of double boiler, over direct heat. Add 1 cup milk, heat over boiling water. Add remaining milk, flour and salt until smooth. Stir into hot mixture. Cook 5 minutes, stirring constantly. Cover. Cook 10 minutes longer, stirring occasionally. Add mixture to egg, return to double boiler and cook 2 minutes. Cool. Add vanilla.