Macadamia swirl Easter cake - Australian Macadamias

Ingredients

• ¾ cup macadamias
• ½ cup brown sugar
• 2 tbsp cocoa powder
• 185 g unsalted butter
• 1½ cup caster sugar
• 3 eggs
• 1 tsp vanilla essence
• 3 cups plain flour (sifted)
• 2 tsp baking powder
• 1½ tsp bicarbonate of soda
• 2 cups sour cream
• ½ cup unsalted butter (at room temperature)
• 2½ cups icing sugar ( sifted)
• Yellow food colouring
• 50 g store bought white royal icing
• Your choice of food colouring
• 8-10 whole macadamia nuts
• 8-10 gold dragees
• ½ cup shredded coconut
• ½ cup roasted macadamias (finely chopped)
• Edible flowers