The customers will show you what they want on a parchment. Pull the string to pour their drink, then click on it to pick it up. Click on the tray to place it there. At the same time, click to take the food item they want from one of the bags on the right and place it in the oven. When it's ready, but before it burns, click to pick it up, and then again to place it on the tray. Fill customers orders before they get impatient and leave.