In a large bowl, cream butter and sugar until light and fluffy. Beat in eggs, one at a time, beating well after each addition. Combine milk, vanilla and lemon zest; set aside. Reserve 1 tablespoon sesame seeds. Combine remaining sesame seeds with the flour, baking powder and salt. Add dry ingredients to creamed mixture alternately with milk mixture, beating well after each addition.
Pour into a greased and floured 9x5-in. loaf pan. Sprinkle with reserved sesame seeds. Bake at 325° for 60-70 minutes or until a toothpick inserted in the center comes out clean. Cool in pan for 10 minutes before removing to a wire rack to cool completely. Serve with fruit if desired.