If you want to have a nice Tibet food, you have to go to Lhasa Snowland Restaurant. The owner and owner's wife are Tibetan that ever studied in Switzerland and India. They serve Tibet, India, Chinese and western food. You will be satisfied at their small cozy restaurant.
Let the Google Map tell you where the snowland restaurant is!

Qing Ke soup.

Tibet style spicy potato .

Qing Ke wine, very sweet.