Minecraft wiki entry for Furniture, associated text: First, place your two dispensers on top of each other. Fill the dispensers with food, Then, to the exact left/right block depending on where you are placing it, put the Redstone. Then, in front of the Redstone, stack the blocks and put a button on the bottom block. Place the iron door in front of the dispensers. If you click the button, food comes out and the door closes.