Red Wine Velvet Cake with Whipped Mascarpone

Ingredients

• 225g unsalted butter, at room temperature, plus more for tins
• 400g plain flour, plus more for tins
• 430g dark brown sugar
• 150g granulated sugar
• 4 large eggs, at room temperature
• 530ml red wine (any kind you like)
• 2 tsp vanilla extract
• 130g Dutch cocoa powder
• ½ tsp bicarbonate of soda
• 1 tsp baking powder
• ¾ tsp ground cinnamon
• ¾ tsp table salt
• 450g mascarpone cheese
• 280g icing sugar
• Pinch of salt
• ¼ tsp vanilla extract