Delicious Bulgarian Baklava Recipe (Walnut pie)

Name: Delicious Bulgarian Baklava Recipe (Walnut pie)
Prep time: 15 min
Cook time: 2 h 30 min
Total time: 2 h 45 min
Cuisine: European, Eastern European
Ingredients: 3 1/2 cups walnuts (chopped); 1 cup powdered sugar; 1 1/2 cups ground or chopped almonds; 2 cups butter (melted - reserve 2 tablespoons for brushing the dough.); 40 sheets filo pastry (thawed); 1 1/2 cups powdered sugar; 1 cup water; juice and zest of 1 lemon; melted chocolate for garnish (optional); ground almonds for garnish (optional)