01 - Preheat oven to 350°F. Grease a 9x13-inch baking pan thoroughly with melted butter.
02 - Combine walnuts, almonds, pistachios (if using), sugar, cinnamon, and cloves in a mixing bowl. Stir until evenly blended.
03 - Place one phyllo sheet in prepared pan. Brush lightly with melted butter. Repeat layering and buttering 6–8 sheets total for the base.
04 - Sprinkle one-third of the nut mixture evenly across the buttered phyllo base.
05 - Layer and butter 4–5 additional phyllo sheets. Distribute another one-third of nut mixture over the surface.
06 - Repeat with 4–5 more buttered phyllo sheets, followed by the remaining one-third of nut filling.
07 - Complete with remaining phyllo sheets, buttering each individually including the final top layer.
08 - Using a sharp knife, slice the layered pastry into diamond or square shapes. Cut completely through to the bottom.
09 - Bake for 35–40 minutes until layers turn golden brown and crisp throughout.
10 - While baking, combine sugar, water, and lemon juice in a medium saucepan. Boil for 8–10 minutes until sugar dissolves. Remove from heat and stir in honey plus rose or orange blossom water if using.
11 - Immediately pour hot syrup evenly over hot baked baklava. Allow to cool completely at room temperature so syrup absorbs fully before serving.