Ingredients

• Vegetable oil for greasing pan
• 2 lb rhubarb stalks, cut into 1-inch pieces
• 2/3 cup confectioners sugar

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Instructions

1. Put oven rack in middle position and preheat oven to 375°F. Lightly oil a large shallow baking pan with vegetable oil.
2. Arrange rhubarb in 1 layer in pan and sift confectioners sugar evenly over top. Bake, stirring occasionally, until rhubarb is very tender, 25 to 30 minutes.
3. Transfer rhubarb to a food processor and purée until smooth. Force through a medium-mesh sieve into a bowl, discarding solids, and cool completely.