by Claudine Zap If you're hankering for a hamburger for lunch, what to order may be the easy part of your decision. The tougher choice: Where to go? That's right, it's your burger war roundup. First up, Whopper Bar Yup, you read that right. The BK has opened a specialty restaurant called the Whopper Bar , which serves up variations on the Whopper sandwich. The flagship opened at New York's Times Square ,