Triple chocolate mousse tart

Method

• 1
  Grease a 6cm-deep, 22cm round springform pan. Line base with baking paper. Place biscuits and flour in a processor. Process until finely chopped. Add butter. Process until combined. Press mixture evenly over base of prepared pan. Refrigerate for 30 minutes.
• 2
  Make chocolate ganache: Place chocolate and cream in a small saucepan over medium-low heat. Cook, stirring constantly, for 3 to 4 minutes or until smooth. Pour over biscuit base. Refrigerate for 30 minutes or until set.
• 3
  Meanwhile, make chocolate mousse: Place chocolate, vanilla and half the cream in a saucepan over medium-low heat. Cook, stirring constantly, for 3 to 4 minutes or until smooth. Remove from heat. Cool for 15 minutes. Using an electric mixer, beat remaining cream until soft peaks form. Fold chocolate mixture into cream. Gently pour over ganache layer. Refrigerate overnight. Dust with cocoa. Serve.