The closest actual resturant is at the Mall at Millenia. It is about 30 minutes from the Disney property just past Universal Studios. Like the other post stated the one in Disney Quest has the desserts and coffees and some quick service sandwiches, pizza, etc. but it does not compare to the actual restuarant by any means.
Just a side note, if you want to go into Disney Quest to eat there you can go to the guest realtions window and they will usually issue you an hour pass as long as you return within the time they allot you, you can eat there and you don't have to pay to get in. They will do this if it is not really busy there.