RHUBARB-RASPBERRY JALOUSIE

Steps:

• Melt butter in heavy medium saucepan over medium heat. Add rhubarb. Cover and simmer until rhubarb is tender and falling apart, about 10 minutes. Add preserves and 1/4 cup sugar. Cook uncovered until very thick and reduced to 2 cups, stirring frequently, about 35 minutes. Refrigerate filling uncovered until cold, at least 1 hour. (Can be prepared 2 days ahead. Cover and keep refrigerated.)
• Preheat oven to 400°F. Line large baking sheet with parchment paper. Roll out pastry on lightly floured surface to 16x12-inch rectangle. Cut pastry in half lengthwise, forming two 16x6-inch rectangles. Place 1 rectangle on prepared baking sheet. Leaving 1-inch plain border, spoon filling onto pastry. Brush border with glaze. Top with second rectangle; press edges firmly to seal. Brush edges with glaze. Fold edges over, forming 1/2-inch border. Press border with tines of fork to seal. Brush top of pastry with glaze; sprinkle with 2 tablespoons sugar. Using sharp knife, cut 1 1/2-inch crosswise slits down center of pastry at 2-inch intervals, exposing filling.
• Bake pastry until golden brown, about 25 minutes. Cool pastry on sheet to lukewarm, about 45 minutes. Cut crosswise into 6 pieces. Serve with ice cream.