When I last edited my original post, I ran out of space to clarify what the difference was in the Sunday menu. The Sunday menu was a "Burgertown" menu, which included a variety of burgers that were made with Impossible Food burgers. The Instagram page states that this is a regular Sunday event. So, if you want their Mexican Menu, avoid Sundays. This past Sunday (July 4th) they also had a brunch menu with an egg McMuffin style burger. But, it was listed as a July 4th special, so if you want to try this menu you should check the Instagram page to see if they offer it again. Also, in the original post I stated that the menu changes weekly. That was the case at the Bibi-Ji pop-up. However, when I spoke to the owner on Sunday he stated that it will be changing monthly at the current location. Again, he will most likely update the Instagram page with the current menu.