Run your own restaurant and beat your opponent! After choosing and buying the land where you´re going to build your restaurant you´re given the possibility of improving the serving speed with new employees and adding upgrades for better profit or increased capacity. Beat your opponent reaching first to the target goal.
Keeping your serving speed high will help you not loosing clients, besides i´d recommend you to prefer mostly the upgrades which improves the capacity. Also, you can use Ice Cream, News-Stand or benches to slow down costumers; allowing you to save lost clients.