Taco Machine

I've wondered why this feat of engineering hasn't taken off yet but here goes.  You walk into Taco Bell, use a touch screen to order exactly what you want and then a machine builds your taco for you.  The machine would have guns that would squirt sour cream or refried beans into a flour tortilla on a conveyor and the meat could all be cooked and seasoned that very second.  A few seconds after you swipe you credit card the machine would spit out a piping hot exactly what you ordered taco/burrito/chalupa.   It would reduce labor costs because you would only need someone to clean up the place and keep track of the machine.  You would probably enjoy higher customer satisfaction due to the fresh nature of the food as well.