INGREDIENTS
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4 tablespoons unsalted butter, melted
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1/2 cup all-purpose flour
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1/4 cup sugar
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Coarse salt
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1 1/2 sticks unsalted butter, room temperature, plus more for buttering pan
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1 pound rhubarb, trimmed and cut on a very sharp diagonal about 1/2 inch thick
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1 3/4 cups sugar
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1 1/2 cups all-purpose flour
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1 1/2 teaspoons baking powder
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Coarse salt
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1/2 teaspoon finely grated orange zest plus 1 tablespoon fresh orange juice
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2 large eggs
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1 cup sour cream
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