Heat a large saute pan over medium heat. Melt the butter, and then add the pears, cut-side down, cooking until they are slightly golden brown, about 5 minutes. Add the brown sugar and continue cooking until caramelized, another 5 minutes. Add the bourbon, if using, and continue cooking for 5 more minutes.
Divide the pears among 4 plates, garnish with a scoop of ice cream, a drizzle of the caramel sauce and crumbled graham crackers.
Depending on the season, pears can be replaced by peaches, nectarines, apricots or plums.