Canadian astronaut Chris Hadfield shows us his "kitchen" in space and prepares a 0-g treat. Free-floating food-eating ensues, complete with a tumbling tortilla.
Hadfield isn't the only astronaut to make news by eating a sandwich in space. In 1965 Gemini astronaut John Young snuck a corned beef sandwich into space — an action that resulted in a congressional hearing.
Here's some more images of space food. These are served on the ISS (picture from 2003):
View of Astronaut Peggy Whitson, flight engineer (left) and Cosmonaut Valery Korzun, commander (right), eating a meal in the Service Module (SM)/Zvezda. Tomato and hamburger are floating.