Xanth is a fantasy world created by author Piers Anthony for his Xanth series of novels, also known as The Magic of Xanth.
The dessert known as "Eye Scream" (made from the eyes of scream birds and not to be confused with "Eye Smilk") was introduced as a magical item in a book called "The Source of Magic" by Piers Anthony. This is the second in the Xanth series of books, first released in 1979. The series currently totals at least 28 novels with more planned for release in the near future.
The Royal Eye Screams are a royal family, of sorts, in the land of Xanth.
Not sure if they have kings or queens, but they definitely have royal treatment for themselves and those around them.
So they do share their talents....and their generosity is known far-and-wide.
I don't know if they have any Eye Screams nearby.... but there's been some scream birds known to hang out in the area, so you never know what you might find if you just look close enough.
Kinda what i thought it would look like too...
Enjoy the hunt.... beware the mundane-folk...
er muggles... around at most times.