Every once and a while, my mother follows one of my recipes. Actually, "follows" is too exacting a word for what goes on. Let's just say, every once and a while, my mother decides to cook something of mine she's seen in the New York Times.
It may surprise you to find that there is no actual pineapple in a pineapple bun. Instead, the pastry was named for its similar appearance to a pineapple's exterior. And they can be filled with just about anything.