White Chocolate and Hazelnut Cake

Name: White Chocolate and Hazelnut Cake
Ingredients: 500 g unsalted butter, softened, plus extra to grease; 150 g chopped roasted hazelnuts; 550 g caster sugar; 1 tsp. vanilla bean paste; 10 medium eggs; 525 g plain flour; 2 1/2 tsp. baking powder; 100 mL milk; 8 blanched hazelnuts; 50 g caster sugar; 3/4 tbsp. golden syrup; 8 wooden skewers/cocktail sticks; 1 large orange; 100 g white chocolate, roughly chopped; 6 medium egg whites; 250 g caster sugar; 300 g unsalted butter, chopped and softened; 100 mL double cream; 125 g white chocolate, roughly chopped