INGREDIENTS
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1/4 cup roughly chopped walnuts
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1/4 cup old fashioned oats (not instant)
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1/4 teaspoon cinnamon
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3/4 cup flour
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1/3 cup light brown sugar
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1 tablespoon sugar
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4 tablespoons unsalted butter
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2 1/2 pounds rhubarb, cut into 1/2-inch pieces
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1/2 cup plus 2 tablespoons sugar
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3 tablespoons all-purpose flour