Chocolate Cheesecake with Marshmallow Topping

• 160 g granulated sugar

Chocolate Cheesecake

• 100 g unsalted butter, diced
• 150 g rich tea biscuits
• 150 g shortbread biscuits
• 200 g dark chocolate, small pieces or callets
• 350 g cream cheese
• 150 g granulated sugar
• 1 Tbsp cocoa powder
• ½ tsp vanilla extract
• 3 large eggs

Marshmallow Topping

• 3 egg whites, from large eggs
• 1 tsp cornflour
• 2 tsp lemon juice
• 1 pinch fine sea salt