Roasted Rhubarb Tarts with Strawberry Sauce

Preparation

1. Bake pastry:

   Step 1

   Preheat oven to 425°F.

   Step 2

   Unfold puff pastry sheet and gently roll out with a floured rolling pin on a very lightly floured surface into a 12-inch square. Trim edges with a sharp knife, then cut pastry into 6 rectangles (about 6 by 4 inches each). Arrange rectangles 1 to 2 inches apart on an ungreased baking sheet and prick them all over with a fork.

   Step 3

   Bake in middle of oven until pastry is puffed and golden, 13 to 15 minutes. Cool pastry on baking sheet on a rack.

2. Roast rhubarb while pastry is cooling:

   Step 4

   Reduce oven temperature to 375°F.

   Step 5

   Arrange rhubarb in 1 layer in a lightly oiled shallow 15- by 10-inch baking pan (preferably nonstick) and sift 2 tablespoons confectioners sugar evenly over it. Roast in middle of oven until tender, 15 to 25 minutes, then cool in pan on a rack.

   Step 6

   Make strawberry sauce and cream filling while rhubarb is roasting: Purée strawberries with syrup in a food processor, then force purée through a very fine sieve into a bowl.

   Step 7

   Sift 5 tablespoons confectioners sugar over crème fraîche and whisk to combine.

3. Assemble tarts:

   Step 8

   Sift remaining tablespoon confectioners sugar over pastry rectangles. Make a 3-inch lengthwise trough in the center of each rectangle by gently tapping with back of a teaspoon. Divide cream filling among troughs and top with rhubarb, then drizzle with strawberry sauce.