It's a teppan
, Japanese style cooking grill. Read this Wikipedia article on teppanyaki
. As msmofet says, customers sit around three sides while the chef cooks and entertains them. Typically he cooks shrimp, vegetables, chicken, beef, fried rice, etc. Appetizers are cooked and served first and then you enjoy them while the chef is cooking dinner. Everything can be made on this one cooking surface.