Geode Cake

Sugar Crystals

• 500 g caster sugar
• 2 Tbsp glucose syrup
• 4 drops purple food colouring gel
• 2140 g water
• 2 tsp vinegar

Cakes

• unsalted butter, for greasing
• 400 g caster sugar
• 400 g unsalted butter, diced, room temperature
• ½ tsp fine sea salt
• 1 Tbsp vanilla bean paste
• 6 medium eggs
• 50 g unsweetened cocoa powder
• 1 Tbsp baking powder
• 350 g plain flour

Filling

• 450 g mascarpone
• 450 g whipping cream
• 150 g caster sugar
• 25 g cocoa powder, unsweetened
• 500 g ripe mangoes, cut in pieces (2 cm)
• 2 Tbsp chocolate chips

Decoration

• 750 - 1000 g fondant icing (white)
• icing sugar, for sprinkling
• 2 - 3 drops yellow food colouring gel