Ceru in South Kensington offers a menu inspired by cuisines from the Levant region (Turkey, Cyprus, Lebanon, Syria, Israel, Jordan). Their menu caters for a wide range of tastes, and their all day menu is entirely gluten free (excluding the pita bread)!
From Bea Vo, who founded Stax and Boondocks comes another USA style restaurant right next to Camden Town called The Famous Flames! This is a Stax sized restaurant i.e. limited seating but the food is great to take away also.