Dissolve cornstarch in white wine vinegar; set aside. Combine all ingredients including, except for ham steaks in saucepan. Add cornstarch mixture and bring to a slow boil, stirring often. Reduce heat and simmer for 4 minutes. Grill ham for 7 minutes on each side. Baste both sides of steak with sauce while grilling. Transfer steak to serving platter a pour remaining sauce on top. SERVES 2 * Chicken Broth may be substituted for white wine.