INGREDIENTS
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1/2 cup (1 stick) unsalted butter, at room temperature
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3/4 cup confectioners' sugar
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1/4 cup Irish whiskey
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5 cups quartered strawberries
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3 cups sliced rhubarb, about 1/3-inch thick (fresh or frozen and thawed)
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1/2 cup sugar
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1/4 cup cornstarch
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1 teaspoon fresh lemon juice
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3/4 cup flour
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3/4 cup old-fashioned oats
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2/3 cup packed light brown sugar
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Pinch salt
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6 tablespoons cold unsalted butter, diced