Lay the baguette slices in a single layer on a large baking sheet. Stir together the butter, 4 tablespoons brown sugar and cinnamon and spread on one side of each baguette slice. Broil for 1 to 2 minutes or until bubbly and bread is lightly browned on the edges. Stir together the remaining brown sugar, fruit and lime juice in a small bowl. Spoon equal amounts over the bread slices and sprinkle with walnuts.
