As it happens I am writing this on Gengy's Mongolian Barbeque restaurant and battery is low on my laptop so no time to research if this has been baked?
How about a food court with 12 ethnic restaurants and,
several soundproof cabins. This would be good to keep the general open area more quiet.
Groups in cabins could have their own private conversation in privacy and have more intimate dining experience and,
Variable theatre style blinds you can pull down to change the decor to suit the food and,
Jukebox in each cabin to select suitable ethnic music to suit the decor and menu.
If people are eating food from various restaurants the music would be mix of the and decor could be different on each wall.
Also for some private occasion like birthdays you would be able to bring your own music in a CD and supply your own photos and posters to be hung on the wall.