INGREDIENTS
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2 & 1/4 cups all-purpose flour
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1/4 cup unsweetened cocoa powder
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1 tablespoon granulated sugar
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1 teaspoon salt
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1 cup unsalted butter, cold and cut into 1/2-inch cubes
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6 to 8 tablespoons cold water
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3.5 ounces bittersweet chocolate, finely chopped
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1/3 cup heavy cream
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1/3 cup chocolate-hazelnut spread, such as Nutella
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1 large egg
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1 tablespoon water
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sanding sugar