Chocolate truffle cake

Cake

• butter, for greasing
• 4 eggs
• 120 g caster sugar
• 1 tsp natural vanilla extract
• 30 g cornflour
• 80 g self-raising flour
• 2 tbsp cocoa powder
• 1 pinch salt
• 2 tbsp coffee liqueur
• 2 tbsp full cream milk
• 150 g dark chocolate, broken into pieces
• 450 g pouring (whipping) cream

Ganache

• 200 g dark chocolate, broken into pieces
• 90 g unsalted butter
• fresh mixed berries, for decorating