01 - Preheat oven to 350°F. Generously grease a 9x13-inch baking pan with melted butter, ensuring all corners are coated.
02 - Combine walnuts, almonds, pistachios (if using), sugar, cinnamon, and cloves in a mixing bowl. Mix thoroughly until spices are evenly distributed throughout the nuts.
03 - Lay first phyllo sheet in prepared pan. Brush lightly with melted butter. Repeat layering and buttering 6-8 sheets to establish the bottom foundation.
04 - Sprinkle one-third of nut mixture evenly across the phyllo base, ensuring complete coverage to the edges.
05 - Layer and butter 4-5 additional phyllo sheets. Distribute second one-third of nut mixture over this layer.
06 - Add another 4-5 buttered phyllo sheets. Spread remaining one-third of nut filling across this layer.
07 - Finish with remaining phyllo sheets, buttering each individually including the topmost layer.
08 - Using a sharp knife, slice baklava into diamond or square shapes before baking. Cut completely through all layers.
09 - Bake for 35-40 minutes until layers achieve deep golden color and crispy texture throughout.
10 - While baklava bakes, combine sugar, water, and lemon juice in medium saucepan. Boil for 8-10 minutes until sugar dissolves completely. 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 fully absorbs before serving.