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Grease a pie pan and dust with the cocoa powder.
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In a microwave, combine the chocolate and butter.
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In a large bowl, using an electric mixer fitted with the whisk attachment, beat together the egg yolks, 6 tablespoons of the granulated sugar, the espresso, vanilla and salt on medium-high speed until pale and very thick, about 3 to 5 minutes. Gradually pour in the chocolate mixture and continue beating until well blended.
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In a separate bowl beat the egg whites on medium-high speed until foamy, about 1 minute. Gradually add the remaining 3 tablespoons granulated sugar and continue to beat until medium-firm peaks form, about 2 minutes. Scoop half of the egg whites onto the chocolate mixture and fold them in gently. Fold in the remaining whites just until no streaks remain.
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Pour the batter into the prepared pan and spread it out evenly. Bake in a 300F oven until the torte puffs slightly and a toothpick inserted into the center comes out very moist but not liquid, about 38-40 minutes. Transfer the pan to a wire rack and let cool for 30 minutes.
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Let the torte cool completely, then cover and refrigerate until very cold, at least 4 hours or up to overnight.
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Garnish the torte with the raspberries and dust with confectioners' sugar.