Not to veer off topic, but since the original question has been answered, (yes, you can sub, and yes, you can ask that gravy be left off the spuds),....but those of us who are not "picky" eaters have a hard time with the term, as the term has no specific meaning. Someone who only eats sweetbreads and foie gras is a "picky eater" just the same as someone who only eats a burger with nothing else on it. Folks on this board use the term as if it has well-known parameters when indeed it does not. For example, I would wager that most people who identify themselves as picky eaters would have far more difficulty with the garlic in the potatoes than the gravy on them. As noted above, the menu at 50's PT is pretty basic and most people with strong food preferences (or needs, or phobias) will find something there to enjoy. But simply saying: "I'm a picky eater. Can I dine at X Restaurant" really says nothing at all to those of us who don't know what the "picky" issue is. Best to help identify the issue specifically (as the OP did here) than to rest on the term "picky" and expect everyone else to "relate" to it.