Our research has shown this one wasn’t entirely true, but close. 1935 Laws of Wisconsin, Chapter 106 required serving a small amount of cheese and butter with meals in restaurants (eff. June 1935 – March 1937).
Source: Columbus Ledger – Enquirer (August 08, 2002)
Sec. 18-53. Conduct in drive-in restaurants. (a) In this section “drive-in restaurant” means any restaurant where meals, sandwiches, ice cream, or other food, is served directly to or is permitted to be consumed by patrons in automobiles, motorcycles or other vehicles parked on the premises. (b) It shall be unlawful for any person while on…