Cream butter and sugar well in mixing bowl. Add eggs. Mix flour, salt and baking powder and add alternately with milk to creamed mixture. Add nuts and lemon zest and mix well. Pour into a greased 5 1/4x9 1/4x3-inch loaf pan. Bake in preheated 350F oven 1 hour or until done. Mix sugar and lemon juice in small pan over low heat to dissolve sugar. Pour sauce over hot bread in pan. Cool in pan. Remove and slice.