Once you have analytics set up, you can set conversion goals on your website. Check out Google's conversion guide here, or watch a video overview of conversion tracking goals.
Set up conversion goals for your menu page, reservation page, find us page (if you have one), contact us page (if you have one), and any other page on your website that you want your customers to visit. Using conversion tracking, you can start to measure your website's ability to convert visitors into customers.