Not only a fire elemental / gennasi for the main course, also an ice elemental / gennasi to prepare your desserts.

An illusionist could create a desired ambience.

All the lighting would be magical and permanent and the walls and floor could be built by creating the materials so e.g. it could be made of wood but you don't see seams between boards but one continuous area.

You are served by magical creatures (elementals? Imps? ...).

By trigger (e.g. one full circle on the rim of your glass with a finger) you can refill your drink.


If everything is achievable by magic I would suppose there are interesting options:
- it could be a small restaurant where one magic user is doing all the necessary stuff. You pay a fixed amount per person and you will get a fine meal. Imagine a small Japanese ramen bar with that one perfect recipe of ramen
- it could be extravagant and be a place for high society to enjoy everything you can think of. It could be more of a show than a restaurant.
- Maybe the main attraction is the once per day use of a fancy artifact that is placed prominently in the center of the room on a pedestule.
- maybe it doubles as / is part of a place of worsbip for a deity of magic.