Singapore is a Chinese vegetarian restaurant that is a ritual for me on trips to Philadelphia. I can only talk about one dish there because I order it every time - the orange "beef." This is fried vegetable protein cooked in the same manner as beef in orange sauce, and I can say, as a devout carnivore, it tastes better than the meat version. It doesn’t taste exactly like meat; it’s lighter and crispier, but it’s delicious.
The ambience is of a typical Chinese restaurant, but slightly more new age (lots of vegetarian advocacy, and they were slightly disappointed when I said I wanted white rice!), but the service is quite friendly and the prices reasonable (entrees are under $10.)