Heat the pulled pork up over medium high heat in a heavy-bottomed skillet, stirring frequently until hot all the way through and scrape into a bowl. Return the pan to the heat and melt half of the butter in the pan. Lay down one piece of bread, arrange the hot pork on it, butter the second piece of bread and put it on top, buttered side up. Fry until the bottom piece is a deep golden brown. Slide one spatula under the sandwich and lay a second spatula on top of the sandwich, using gentle pressure to hold it together as you flip it.