I am sure you are all familiar with the traditional salad-bar concept. You walk up to a selection of ingredients and fix yourself a personalized salad. Burger Bar takes that idea and steals it on behalf of carnivores everywhere (but primarily in Las Vegas!). There is no need for a sneeze guard at Burger Bar since all of the available ingredients, or burger toppings if you will, are listed on the menu. They do offer pre-designed burgers that range from reasonable to not-so-reasonable price-wise, but the fun as far as I am concerned is in building my own burger.
For eaters more adventurous than I, which basically means everyone, Burger Bar is one of the few places in Las Vegas where I would suggest you go to frequently. With so many restaurants in Las Vegas it is hard to go someplace you have been before at the expense of trying somewhere new, but I try to apply that concept to dinner more than I do for lunch. Burger Bar, though a fantastic dinner spot, works well for lunch too. Each time you go, you can create a new burger blueprint like one you have never had before. There are enough options to keep you entertained visit after visit. And even though I basically get the same thing everytime, it hasn't gotten old yet.
Angus Beef + Sesame seed roll + Bacon + Cheddar cheese + Fried egg = Bliss. Add their Brown gravy and you'll wonder why anyone puts ketchup on a burger (and it's GREAT on their skinny fries).
When, not if, you go looking for Burger Bar, you'll find it in Mandalay Bay in the Mandalay Place.