There is now a real Hunan restaurant in Fairfax, near Fair Oaks Mall, menu here, their web site is here, 3903 Fair Ridge Drive, Unit H, in the mall with the Harris Teeter. It attracts an almost exclusively Chinese clientele and, to my untrained eye, some of them seem to be the Uighur group which hangs out in Fairfax but does not (yet?) have a restaurant of its own.
This place is not cooking at the exalted level of Sichuan Pavilion in Rockville, but it is competitive with the other semi-authentic Chinese places in this region. I sampled five dishes and all were very good. I have yet to figure out the optimal dishes to order but I may post more when I do so. Recommended to anyone with an interest in real Chinese food.