01 - Preheat oven to 350°F. Generously grease a 9x13-inch baking pan with melted butter.
02 - Combine walnuts, almonds, pistachios (if using), sugar, cinnamon, and cloves in a mixing bowl. Toss until evenly distributed.
03 - Place one phyllo sheet in the prepared pan. Brush lightly with melted butter. Repeat layering and buttering 6-8 sheets total.
04 - Sprinkle one-third of the nut mixture evenly across the buttered phyllo sheets.
05 - Layer and butter 4-5 more phyllo sheets. Add another one-third of the nut mixture. Repeat with another 4-5 buttered sheets and remaining nuts.
06 - Finish with remaining phyllo sheets, buttering each thoroughly including the final top layer.
07 - Using a sharp knife, cut baklava into diamond or square shapes before baking.
08 - Bake for 35-40 minutes until layers turn golden brown and crisp.
09 - While baklava bakes, combine sugar, water, and lemon juice in a medium saucepan. Boil for 8-10 minutes. Remove from heat and stir in honey plus rose or orange blossom water if desired.
10 - Immediately pour hot syrup evenly over hot baked baklava. Allow to cool completely so syrup fully absorbs before serving.