Decadent chocolate and Guinness mud cake - Starts at 60

Ingredients

• 250g butter, chopped
• 200g dark chocolate (50% cocoa), chopped
• 100g dark chocolate (70% cocoa), chopped
• 215g (1 cup) caster sugar
• 100g (1/2 cup firmly packed) dark brown sugar
• 250ml (1 cup) Guinness Extra Stout
• 1 tablespoon golden syrup
• 2 teaspoons vanilla extract
• 3 eggs
• 85g (1/3 cup) sour cream
• 225g (1 1/2 cups) plain flour
• 2 tablespoons dark cocoa powder
• 1 teaspoon baking powder Ganache
• 190g (3/4 cup) sour cream
• 2 tablespoons Guinness Extra Stout
• 1 1/2 tablespoons golden syrup