Preheat over to 350 degrees. Cut the pineapple quarters into 1/3" thick slices. Combine the sugar and the butter in a saucepan over medium heat. When the butter has melted, whisk in butter to combine and continue stirring while the sauce simmers for 3-4 minutes. 

When the sugar and butter have combined and are bubbly, smooth and thick, remove from the heat. Pour the caramelized sugar mixture into a 9" pan, spread with a spatula to coat the bottom of the pan. Arrange the pineapple slices on top of the caramel in a single layer.

Prepare Simple Mills Yellow Cake Mix as box instructs. Pour on top of sugar/pineapple base in cake pan. Bake 35 minutes.

Let cool; cut into desired pieces, and use a spatula to remove from cake pan, serving with bottom side (pineapple) on top.