Prune & Walnut Layer Cake

Ingredients

• 1 cup unsalted butter (228g)
• 1 cup granulated sugar (200g)
• 4 egg yolks - large grade A
• 1/2 cup dark brown sugar (110g)
• 1 tbsp orange zest (6g)
• 1 cup heavy cream (237ml)
• 1 tsp vanilla extract (4.3g)
• 2 1/2 cup all purpose flour (300g)
• 2 tsp baking powder (8g)
• 1/2 tsp baking soda (2g)
• 1/2 tsp salt (3g)
• 1 tsp ground cinnamon (2.3g)
• 1/2 tsp ground nutmeg (1.1g)
• 1/2 tsp ground mace (1.1g)
• 1/2 tsp ground cloves (1.1g)
• 1 1/2 cup chopped dried prunes (the moist ones) (170g)
• 1 cup toasted chopped walnuts (110g)
• 4 egg whites - grade A large
• 1/3 cup granulated sugar (67g)
• 1 full recipe Italian Buttercream (Italian Buttercream)
• 1/2 tsp fresh grated nutmeg (1.1g)