There are restaurants and cafes dotted throughout Mix C, the city's snazziest shopping mall, but head up to the 6th floor to find the best-value offerings, inside a small Hong Kong–style food court called Skyland Discovery. You'll find dim sum, noodles, roast duck and more, and with English labelling and dishes on display it's a cinch to order what you want.
Buy a payment card (¥10 deposit) as you enter and top it up with as much cash as you think you'll need for your meal. Any unused cash gets returned with your deposit when you leave.