Accompanying the aforementioned plain rice patty is sauteed cabbage, mayonnaise, and a "hot and sour soup" sauce, which looks like it contains tofu and possibly pork.
Also making a return to Lotteria is noodles-as-a-patty in the Mongolian Tanmen Burger, which features a mound of noodles topped with sauteed cabbage, miso, and the same sweet and sour sauce. The Mongolian Tanmen Burger comes with a cup of actual hot and sour soup on the side to mimic its namesake dish, which is a noodle soup similar to ramen.
The two limited-time items were created in partnership with Moko Tanmen Nakamoto, a chain of Mongolian-style ramen restaurants in the Tokyo area, hence the reference to Mongolia in the burger names.
The Mongolian Bowl Burger costs 340 Yen (~$2.75 US) whereas the Mongolian Tanmen Burger goes for 650 Yen (~$5.26 US). Both limited-time burgers were released on May 19 and are slated to stick around until the end of June.
