At 3:30pm, there were very few options open at Mandalay Bay. We almost went to Noodle Shop but the Yelp reviews were so scary that we decided to do Fleur instead.
Unfortunately, there were very few entrees on the menu. We got the massive HK Burger to share. The $25 price tag is a bit high and it does come with many toppings for that price (although you do need to pay more for truffles). We got it with monterey jack, bacon, avocado, and truffle mayo (should've added Wild Mushrooms too). It was legit. We had a huge dinner coming up in a few hours and this big burger was perfect for two people to share. And the fries, yum! This is coming from someone who doesn't even like fries that much.