Yule Log

Cake

• 30 g caster sugar
• ½ tsp cream of tartar
• 4 tsp cornflour
• 4 large eggs, at room temperature, separated
• 150 g caster sugar
• 1 ½ tsp natural vanilla extract
• 1 pinch fine sea salt
• 50 g cocoa powder
• 5 Tbsp icing sugar, plus extra for dusting

Icing

• 80 g dark chocolate (50% cocoa solids), small pieces or callets
• 150 g icing sugar
• 1 Tbsp natural vanilla extract
• 120 g unsalted butter, soft, plus extra for greasing

Filling and Assembly

• 200 g double cream