I'm a member of the museum and always try to leave time for a visit to the restaurant while there.
My first time, my dad and I had what were easily the *best* burgers - these made of lamb - that either of us had ever had. And since my mom makes one hell of a burger, that is a high compliment.
The second, my mom ordered an eggplant dish and I suggested the sumac fries. A 78-year-old lady tossed aside her eggplant and happily ate only the fries for lunch - then went out to order some sumac only to discover it really is more than just the spices. It's the way they do it at Diwan.
Yesterday my friends ordered the sizzling tikka chicken. We were influenced by the smell of it wafting from across the restaurant when someone else got it - yes, we were sheep. But for this quality and taste, it's worth it!
I've never had a meal there that wasn't to the highest quality, seasoned beautifully, impeccably prepared, with exemplary customer service and absolutely memorable.
If I had one request, it would be more vegetarian options. It's one of the few places I stray from my usual being Kosher and thus not eating meat (I like to tell myself that being in a Muslim museum, the meat is Halal. My head knows it's not. But I do try to fool myself...)