"At Ballinalacken Castle Country House & Restaurant, the bread is baked in a rectangular pan...."
INGREDIENTS
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Nonstick vegetable oil spray
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3 cups all purpose flour
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3 cups whole wheat flour
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1/2 cup (packed) brown sugar
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1 teaspoon baking soda
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1/4 cup (1/2 stick) chilled margarine or butter, cut into 1/2-inch cubes
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2 cups buttermilk