The Cornell Creative Machines Lab is trying to popularize 3D food printers. From a Lakshmi Sandhana article in Fast Company:

“The newest 3-D food printer, now being honed at CCML, can produce: tiny space shuttle-shaped scallop nuggets (image above); and cakes or cookies that, when you slice into them, reveal a special message buried within, like a wedding date, initials (image below) or a corporate logo. They can also make a solid hamburger patty, with liquid layers of ketchup and mustard, or a hamburger substitute that’s made from vegan or raw foods.

The CCML food printers require edible inks and electronic blueprints called FabApps. This machine prints food using multiple cartridges, going line by line until the desired shape is extruded. ‘The electronic blueprint specifies exactly which materials go where–it is essentially a blueprint of the food item,’ says Hod Lipson, the head of the lab.”