Burger Plate is a fast-food restaurant.
While driving and looking for Marge, Lisa complained that she was sick of eating at restaurants she'd never heard of, such as Skobo's and Dimwillie's. Homer agreed, but then saw Burger Plate and decided to stop there to eat. Bart suggested to pretend it's his birthday to get free food. Homer then decided to pretend that it is all of their birthdays. Annoyed, Lisa just mumbled something.