INGREDIENTS
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1 1/2 cups hazelnuts, toasted and with skins rubbed off
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1 1/2 cups all-purpose flour, plus some for the cake pan
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1 teaspoon baking powder
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1/4 teaspoon salt
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6 tablespoons soft butter, plus a bit for the cake pan
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1 cup plus 2 tablespoons sugar
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3 large eggs
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1 tablespoon extra-virgin olive oil
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1/2 tablespoon finely grated orange zest
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1 cup milk at room temperature
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4 tablespoons semisweet chocolate, chopped by hand in small pieces
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Garnish: powdered sugar or whipped cream
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A 10-inch springform cake pan
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A heavy-duty electric mixer fitted with the whisk