Burgers are made to order, and toppings include fresh-cooked bacon, melted cheese, sauteed onions, fresh lettuce, tomatoes, pickles and more. Notable burgers you won’t want to miss include the “FLIPT” and “Son of a FLIPT,” which are half-pound signature-blend all-beef patties served on a toasted split-top bun. FLIPT’s burgers, fries and shakes are all made from scratch using fresh and high-quality ingredients. Ribbon cutting at FLIPT in Rivers Casino The burger-and-shake restaurant is unique to Rush Street properties and is making its debut at Rivers today, Friday, Dec.