Sumptuous Walnut Syrup Cake Covered with Chocolate Ganache - My Greek Dish

Ingredients

• 400g chopped walnuts (14 ounces)
• 200g butter (7 ounces)
• 170g sugar (6 ounces)
• 7 eggs (separated into whites and yolks)
• 180g breadcrumbs or powdered Melba toast (6.5 ounces)
• 20g baking powder (4 tsps)
• 2 tsps powdered cinnamon
• 1 tsp powdered nutmeg
• 1 tsp grounded clove
• zest of 1 orange
• 75ml cognac (1/3 of a cup)
• 2 cups water
• 2 cups sugar
• 1/4 of a cup cognac
• 1 tsp vanilla extract
• 1 tbsp orange juice
• 250g butter (7 ounces)
• 200g icing sugar (7 ounces)
• 2 tbsps cocoa powder
• 200ml pure (thin) cream (7 fluid ounces)
• 200g good-quality dark chocolate, chopped (7 ounces)