I don't know what they put in their sauce, but it is FANTASTIC! I have been going to the Quarter's restuarants in Albuquerque for 20 years and really prefer the one on Yale. The quality of the meat at all of the restuarants is top notch. You don't get grissly meat or chewy chicken at all! Their sandwiches are very reasonably priced as are most of their platters. In addition to their restuarant service, they also sell their meats and sides in large volumes for parties. At least once a year, I have a party at my house with Quarters BBQ as the fare. It is always a hit because everyone love Quarters!!