It was a treat from a friend who is a local Beijinger. The restaurant is in the hutong with a small entrance door which can be easily missed.
There is no menu, but pre-set dinner in different prices per person. The dishes are small and come very quickly one after another. It's like taste testing Yunnan cuisine with a wide variety from appetizer to main course to dessert. My favorite were the BBQ fish, crispy on the outside and just cooked on the inside; the shrimp salad was tasty with the right amount of spiciness; and the dessert.
I tried other authentic Yunnan restaurant in Beijing, Dianke Dianlai is the best.