INGREDIENTS
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4 tablespoons unsalted butter, melted, plus more butter for pan
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1 1/2 cups unbleached all-purpose flour, plus more for pan
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2 large eggs, room temperature
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2/3 cup granulated sugar
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1/4 cup extra-virgin olive oil
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1/3 cup whole milk
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1/2 teaspoon pure vanilla extract
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3/4 teaspoon baking powder
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1 pinch of sea salt
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Grated zest of 1 lemon
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Grated zest of 1 orange
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10 ounces small fresh purple grapes
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Confectioners' sugar, for garnish