In a medium saucepan, combine the wine, water, sugar, and ginger, and bring to a boil. Reduce the heat to medium-low and simmer, stirring occasionally, until reduced to 1/2 cup, about 15 minutes.
Meanwhile, heat the butter in a skillet and melt. Add the bananas, cut sides down, add the five-spice and cook until golden brown, about 2 minutes. Remove from the heat. Transfer to a bowl. Pour the hot syrup onto the bananas and gently toss. Let stand at least 10 minutes.