The machine hums quietly as its large item door slowly closes. The LEDs on its front blink indicating some kind of processing, although beyond the quiet sound of the servos inside moving the tray up and down, nobody really knows what happens inside, and nobody cares disassemble the thing in fear of not being able to put it back together properly.
Soon the door marked "output" opens, and from it comes a strong if disgusting belch and a small piece of paper that flies out along with it. The note reads "compliments to the chef."
Insert a glass of purified water.