2007, Fern Michaels, Free Fall (page 312)Don loved the minihamburgers even though they gave him horrible indigestion.
2007, Clare Naylor, Mimi Hare, The First Assistant (page 255)... I dropped a minihamburger that I was about to scoff into a potted fig tree so I didn't have to worry about ketchup lips.
2010, Leslie Brokaw, Erin Trahan, Frommer's Montreal and Quebec City 2010 (page 234)A wide selection of appetizers invites grazing: salmon tartar with Rice Krispies and wasabi, perhaps, or minihamburgers.