My dear MIL always made this cheese cake for special occasions. According to my FIL, when they were dating (1955), she took him out to see her home town, Chicago, and they stopped for cheese cake at the Marshall Fields on State Street. He enjoyed it immensely, she won his heart, and they were married. When Marshall Fields stopped baking their cheese cake she searched until she found a recipe that came close. This is the result, and it is a family tradition. We call it "The Way-to-a-Texas-Boy's-Heart Cheese Cake." (Cooking time includes chill time).