INGREDIENTS
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Strawberry-Rhubarb Filling
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1½ pounds rhubarb, sliced crosswise (about 6 cups)
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1½ pounds strawberries, hulled and quartered (about 5 cups)
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1½ cups sugar
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Zest and juice of 2 limes
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¼ cup all-purpose flour
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¼ cup fresh mint, thinly sliced
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Biscuits
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2¼ cups all-purpose flour
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1 tablespoon baking powder
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1/8 teaspoon salt
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Zest of 1 lime
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4 tablespoons cold unsalted butter, cut into small pieces
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1 cup low-fat buttermilk
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Turbinado sugar