INGREDIENTS
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1 1/2 pounds rhubarb, cut into 1-inch pieces (about 4 cups)
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2/3 cup granulated sugar
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Zest and juice of 1 orange
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1 cup all-purpose flour
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1/2 cup dark brown sugar
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1/2 teaspoon cinnamon
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8 tablespoons (1 stick) cold unsalted butter, cut into small pieces
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1/2 cup rolled oats
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1/4 cup hazelnuts, skinned, toasted, and chopped (optional)
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1/2 pint fresh raspberries