Moby Dick, a Persian somewhat-fast-food, was decent. http://www.zagat.com/Search/Details.asp?VID=1&PID=1&LID=7&LSID=15223&BRW=21&NDPH=Gaithersburg%2FShady+Grove%2FOlney&RID=4128
is supposed to be the Zagat's link. Note that the yogurt drink is not very close to an Indian lassi.

I was disappointed in Le Mannequin Pis in nearby Olney. I asked the patron for a recommendation and got something that might be a Belgian regional specialty, but was also a good reason not to do any future mileage runs to Belgium.
Rich