Chocolate cake with meringue layer

Ingredients

• 240 ml (8.1 fl oz) orange juice
• 30 ml (1 fl oz) lime juice
• 5 g (0.18 oz) orange zest
• 4 egg yolks
• 125 g (4.4 oz) brown sugar
• 40 g (1.4 oz) butter
• 5 eggs
• 125 g (4.4 oz) sugar
• 45 g (1.6 oz) flour
• 30 g (1.1 oz) cocoa
• 0.5 tsp baking powder
• 1 tsp vanilla extract
• 3 egg whites
• 140 g (4.9 oz) sugar
• 8 g (0.28 oz) cocoa
• 8 g (0.28 oz) cornstarch
• 1 tsp lime juice
• 25 g (0.88 oz) dark chocolate
• 250 g (8.8 oz) mascarpone
• 540 g (19.0 oz) cream (35%)
• fresh blackberries (to taste)
• 150 ml (5.1 fl oz) orange curd