This torte is made of a chocolate-coffee cake base and filled with a homemade raspberry mousse, all topped off with a bittersweet chocolate ganache glaze. For the cake, preheat the oven to 350 ºF (180 ºC). Grease a 9-inch (23 cm) cake pan and line the bottom with parchment. Dust the sides of the pan with flour, tapping out any excess flour.
Set the cooled chocolate cake into the bottom of the pan. For the raspberry mousse, puree and strain the raspberries and measure out 1 cup (250 mL) to use. Whip the cream to a soft peak, stir in the vanilla, and chill until ready to assemble. Stir the gelatin into ¼ cup (60 mL) of cool water in a small dish and set aside.
Prepare the chocolate mousse layer: combine the chocolate, 3/4 cup of cream, and salt in a microwave-safe bowl. Microwave in 30-second increments, stirring every 30 seconds, until the chocolate has melted and the mixture is smooth. Pour it into a large bowl, and let it cool to room temperature, stirring occasionally.
Pour half of the mousse into the ungreased springform pan. Slice one of the cake layers in half horizontally and place this over the mousse, as centred as possible.