Give Customers (Guests) Candy
Guests generally feel obligated to reciprocate when they receive gifts from others. You can benefit from this by giving your guests after dinner mints or candy. Chocolate works great even if you have to purchase them yourself, the price you pay will be a small investment on your returns.
The mints or candy should always be given when you present the check. Don’t rely upon the guest grabbing the mint at the host stand on the way out, they are not going to go back and give you a larger tip.
Want to take this a step further? Give them a gift with your name on it. Pens are fairly inexpensive, have some made up with your name and the name of the restaurant. For example your pens could say: It was a pleasure to serve you! Your Name. Name of the restaurant. Every time the guest uses this pen, they will think of you.