I never saved any menus, this is all by memory.
The PG is big on seafood, for obvious reasons. There is always some wonderful grilled fish on the menu. I seem to recall the usual meat options, but since I rarely ate them, can't comment much. Don't know about lamb, but we won't be that far from NZ, so maybe.
I don't think the Grill has steak sandwiches for lunch, but I could be wrong. The lunch menus change daily, as I remember. I seem to remember hamburgers once or twice.
The dessert menus seem to change every night too, but you may be able to ask for things like ice cream at any time.
The Grill dinner menu leans heavily on seafood.
And the Apicius menu is a set menu, as you probably know.