Meet up your private tour guide in your hotel lobby at 6:00pm. Follow your guide take taxi or UBER(by your own cost) to Xi'an Local Muslim Quarter NOT the touristy area where you will see lots of restaurants and dozens of muslim food tables along the streetside surrounded many locals are drinking or chatting loudly.
After 10 minites Tuktuk fun ride, continue your fun night by tasting 10 kinds local food items such as stick with vegetables, stick of mushrooms, cumin spicy green beans, sweet nuts candies, sweet potato products, Local Beef burger(Niu Rou Jia Mo), spinach belt noodle,thick king-bread, sticky rice pies, black sesame and nuts dessert, Cumin little baby potato, Lamb BBQ, Toufu or Soybean products, steamed rice noodle with sesame butter, dim sum and etc.. Other than eating, you also can see the cooking process , Mosque and daily supplies stores during wondering.
During the tour your private guide will suggest you sit down along street seat have some local beers or soft drinks as a local if you like!
In the end, your guide will assist you to get a taxi for returning back to your hotel, or you can spend more time in the area by your own.