How to Make It
In a medium saucepan, combine the plantains, butter, brown sugar, vanilla and cinnamon. Add enough water to just cover the plantains and bring to a simmer over moderate heat. Cook until the plantains are very tender, 15 minutes. Using a slotted spoon, transfer the plantains to a medium bowl. Add the rum and lime juice and coarsely mash the plantains. Season with salt and pepper and serve.