Preparation Stir brown sugar and butter in heavy medium saucepan over medium heat until melted and smooth, about 2 minutes. Add cream, rum, and cinnamon and bring to simmer. Simmer until sauce thickens and is reduced to 1 1/2 cups, about 5 minutes. Serve warm. (Can be prepared 2 days ahead. Cover and refrigerate. Bring to simmer before serving.)
Preparation Stir brown sugar and butter in heavy medium saucepan over medium heat until melted and smooth, about 2 minutes. Add cream, rum, and cinnamon and bring to simmer. Simmer until sauce thickens and is reduced to 1 1/2 cups, about 5 minutes. Serve warm. (Can be prepared 2 days ahead. Cover and refrigerate. Bring to simmer before serving.)