Above poster is correct, no fixin's bar at POP.
Cosmic Ray's and Pecos Bills in MK have them. Basically the same things are on them.
Also Restaurantosaurus at AK has one. Those are the only ones that I know of.
They all have the usual things like lettuce, tomato, pickle...but some have sauted onions or mushrooms, saurkraut, cheese sauce (pecos and Restaurantosaurus for sure).
We always eat at Restauntosaurus and I make a mini salad of lettuce, tomatoes and pickles for myself. LOL