INGREDIENTS
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1/2 cup (4 fluid ounces) sunflower or vegetable oil, plus more for the pan
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1 cup (5 ounces) unbleached all-purpose flour, plus more for the pan
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1/2 cup (2 ounces) almond meal or almond flour
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2 teaspoons baking powder
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1/4 teaspoon fine sea salt
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1 large egg
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1/2 cup (4 fluid ounces) half-and-half or whole milk
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Finely grated zest and juice of 1 large lemon
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1 cup (8 ounces) sugar, plus 2 tablespoons
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1/4 teaspoon almond extract
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7 to 9 plums (any variety), , halved and pitted but not peeled
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1/4 cup (1 ounce) sliced almonds
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2 tablespoons unsalted butter, at room temperature