What are the best specialties in Xi'an and where to buy them, I want to bring some back to my friends and relatives? Thank you!

De Maogong crystal cake, dog head date, fire well persimmons, Lintong pomegranate, walnuts, kiwi, preserved beef and mutton, gourd chicken, thick wine, sour plum powder, oil tea, persimmon cake, beef and mutton steamed buns, dragon's beard pastry, stone buns, Shaanxi ginseng, chestnuts, Shaanxi tea, agar jelly and so on

There may be a few more, you can go to the Gulou Huimin Street, where a lot of stores to sell, and also go to the major supermarkets of the Shaanxi stop specialties counter also have