Cooking Light, December 2000. To simplify the making of the topping, substitute bottled fat-free caramel sauce for the sugar and water. Heat the sauce in the microwave for 1 minute, then stir in the raisin mixtures. The raisins should sit in the rum for at least 30 minutes - the longer the better. A galette is a free-form pastry. Slice the banana immediately before arranging them (or add a little lemon juice so as not to discolor). To dress up more, serve warm with vanilla frozen yogurt.