We ate at both of these restaurants in February. Portobello was great! We hadn't eaten there during our last few trips (didn't make the time), but I am really glad that we worked it in on this trip. Both the food and service were excellent. In fact, I believe that it was the best meal during our stay.
We also had lunch at Fulton's. The food was okay - not good or bad - but the service was definately an issue. It was not busy or crowded and we just couldn't understand why everything was so slow and wrong. Maybe the server was having a bad day, but we were both somewhat disappointed.