INGREDIENTS
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2 pounds rhubarb, sliced crosswise 3/4 inch thick
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1 cup granulated sugar
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3/4 cup all-purpose flour
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1/2 cup (1 stick) cold unsalted butter, cut into pieces
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1/2 cup packed light-brown sugar
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1 cup rolled oats
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1/2 teaspoon ground cinnamon
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Vanilla ice cream, for serving (optional)