Combine ingredients to prepare the dishes and drinks ordered by the customers. And do it in a timely manner!
When a customer orders, you have to first click a container, then the right ingredients, and finally the prepared dish. If you do it well you'll see an approval tip over the product. For example for a glass of juice: click on the empty glass, click on the juice of the right color and click on the glass with the juice to deliver it. If they ask for a sandwich, click on the empty dish, then on the ingredients required for this kind of sandwich (there's many possible combinations for a sandwich and they have to be in the right order) and finally on the prepared dish to deliver it.