INGREDIENTS
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For the filling:
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1 tablespoon unsweetened Dutch-process cocoa powder
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3/4 cup hot espresso or strong brewed coffee
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1/3 cup sugar
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1/3 cup semisweet chocolate, chopped
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1 ½ tablespoons cornstarch dissolved in 1 tablespoon water
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pinch of salt
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2 tablespoons unsalted butter, cut into 2 pieces
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½ teaspoon vanilla extract