In a heavy saucepan, combine the brown sugar, water and 1 tablespoon butter. Bring to a boil over medium heat without stirring. Cover and cook for 3 minutes. Stir in cream. Cook and stir over medium-high heat just until mixture comes to a boil, about 1 minute. Remove from the heat.
Whisk in vanilla and salt. Cut remaining butter into small pieces; whisk into sauce, a few pieces at a time, until smooth. Set aside and keep warm.
In a small bowl, combine the bananas, butter, brown sugar, ginger and cinnamon. Unfold puff pastry. On a lightly floured surface, roll out pastry to a 12-in. square.
Cut into four squares; lightly brush edges with water. Place 1/4 cup banana mixture in the center of each square. Bring corners of pastry over filling and twist to form a bundle; pinch edges closed.
Place on an ungreased baking sheet. Bake at 400° for 15-18 minutes or until golden brown. Sprinkle with confectioners’ sugar; serve warm with caramel sauce.
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