Melt jelly and butter in a medium skillet over medium heat until it begins to bubble. Add cherries and cook, stirring 2 to 3 minutes, until cherries are heated through and release their juices. Pour in brandy (if using), and simmer 1 minute longer. Place scoops of ice cream in cones. Pour hot cherries into serving bowls and invert cones on top of warm cherries. Serve immediately.