Ya got me curious, so I Googly'd it. Westword has an article about these sammiches at Midwestern Saloon at 3961 Tennyson St., Freshcraft at 1530 Blake St., Masterpiece Kitchen at 84 Rampart Rd. In Lowry, and Steuben's Food Service at 523 East 17th Ave.
Do your own due diligence - and report back here!