Beat butter at medium speed until creamy. Gradually add sugar; beat well. Add molasses and egg; beat well.
Combine flour and next four ingredients; add to butter mixture alternatively with water, beginning and ending with flour mixture. Mis at low speed after each addition.
Pour batter into a lightly greases and floured loaf pan. Bake at 350 for 35-40 minutes or until wooden toothpick, inserted in center, comes out clean.
Cool slightly in pan on a wire rack.
Serve with whipped cream and extra slices of persimmons.