The New Luther. Photo courtesy of Endless Simmer. ChurchKey’s New Luther sandwich has been named the best new sandwich in America by Endless Simmer. Never seen the New Luther on the menu? That’s because it’s not on it – only ordered by those in the know, only on Sundays between noon and 8 p.m. So what exactly is the New Luther? Well to explain that we need to tell you what the Luther is….