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Preheat the oven to 375°F. Lightly grease a 9" pie pan.
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To make the crust: Combine all the crust ingredients and press the mixture into the bottom and up the sides of the pan. Freeze the crust for 15 minutes (this will prevent over-browning), then bake for 8 to 10 minutes, until it's lightly browned around the edges. Remove from the oven and cool completely.
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To make the filling: Combine the hot water, cocoa, and vanilla in a small measuring cup and set aside.
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Heat the chocolate in a saucepan set over low heat on the stove, or in the microwave in 20-second bursts. Stir the chocolate until completely melted, then let cool for several minutes.
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In a large bowl, whip the cream, sugar, and salt to soft peaks.
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Stir the cocoa mixture into the melted chocolate.
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Using a whisk, fold the chocolate mixture into the whipped cream until no white streaks remain.
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Spread the filling evenly into the cooled crust.
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Refrigerate the pie for at least 1 hour before serving, or until the filling is firm.
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For the topping, whip the cream and sugar together until the mixture is as firm (or soft) as you like.
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Slice the chocolate icebox pie, and top each serving with a dollop of whipped cream and a chocolate curl, if desired.