The book "Titanic - An Illustrated History" by Don Lynch has a picture of the Dining Saloon's actual menu on April 14, 1912 along with many other historical pictures. It also has wonderful paintings by Ken Marschall.
Colonel Gracie does not mention what they had, but he does say the Sunday dinner was best of all. That figures. In many homes of the period the same thing applied. I'm just old enough to remember a time when the Sunday roast was the main culinary event of the week. Times have changed!
Not to be rude but at the time they had there "last dinner" no one had a clue as to what would happen. So i think (i may be wrong) that every meal was a grand event. I dont mean to offened anyone. But doesnt this make sense?