"Rhubarb and strawberries are a great match. You can substitute half the rhubarb with an equal weight of quartered berries...."
INGREDIENTS
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6 tablespoons unsalted butter, melted, plus room-temperature butter for pan
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1 cup all-purpose flour, (spooned and leveled), plus more for pan
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1/2 cup packed light-brown sugar
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1/4 teaspoon salt
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1/2 pound rhubarb, cut into 1/2-inch pieces
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1 tablespoon light-brown sugar
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1 cup all-purpose flour, (spooned and leveled)
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1/2 teaspoon baking powder
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1/4 teaspoon salt
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1/2 cup (1 stick) unsalted butter, room temperature
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1 cup confectioners' sugar
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2 large eggs
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1/2 teaspoon pure vanilla extract