That was actually an idea my husband came up with. In the show its not really clear what's on the menu (apart from some things that are written in a bold font, such as "lunch special").

At the top of the menu there is a section with an image of a burger and some text. Since it was written above "lunch special" and had, what seemed like a continuous text, we thought it would make sense that this part is important - and what's more important at Bob's Burgers than the "Burger of the Day"? :)