"Food Street" ~ located one block behind the Yongjiang Hotel (where I stayed, 1st photo below, which has a great breakfast buffet, 2nd photo below) and diagonally opposite the Wan Da Plaza shopping center (in the background of the 3rd photo below, which features Nanning's motorcycle taxis... dirt cheap, noisy, and a helluva lot of fun to ride, especially at night!). Definitely spend an evening there and sample the foods of Guangxi, Guangdong, Hunan, and Yunnan Provinces.
Zhong Shan Lu is dormant during the day, but at night, every night, you'll know it's time to eat by the crowds packing the endless row of food stalls and grilling areas... place your order, find a seat, order a beer or two, and enjoy. Check out the metal cooking boxes that accompany the fish orders (2nd photo below ~ somewhere under all that good stuff is a tasty and tender whitefish). At the bottom inside are hot coals, so the food is still cooking, and keeps warm, right on your table! Oh, and fresh fruit smoothies, made to your specifications, are available for only $1 US.