Everything about Black Sesame Kitchen is great. Though they are presently doing pop-up dinners at temporary locations until they set up shop in a new location, even now they are selecting terrific sites like the Orchid Hotel's roof-top space for unique, fun dining experiences.
The staff, the (fixed) menu, and the food all make for an amazing experience. There's little more to say than that. Oh yeah, they also provide unlimited wine.
I highly recommend getting a group together for dining at Black Sesame Kitchen. The ideal group size appears to be around 10-15. Call them to discuss your group and make a reservation. After that, prepare for a great dining experience.
You'll not find a better value for your $ or RMB in Beijing!