01 - Preheat your oven to 350°F. Generously grease a 9x13-inch baking pan with melted butter, ensuring all corners and sides are coated.
02 - In a large mixing bowl, combine the chopped walnuts, almonds, pistachios (if using), granulated sugar, ground cinnamon, and ground cloves. Mix thoroughly until all spices are evenly distributed throughout the nuts.
03 - Lay the first sheet of phyllo dough in the prepared pan. Using a pastry brush, lightly coat the entire surface with melted butter. Repeat this process, layering 6-8 sheets total, buttering each sheet individually.
04 - Sprinkle one-third of the nut mixture evenly across the buttered phyllo sheets, ensuring complete coverage to the edges.
05 - Layer 4-5 additional sheets of phyllo dough, buttering each sheet individually. Spread another third of the nut mixture evenly over the phyllo.
06 - Add another 4-5 sheets of buttered phyllo dough. Sprinkle the remaining third of the nut mixture evenly across the surface.
07 - Finish with the remaining phyllo sheets, buttering each sheet individually including the very top layer. Press gently to compact the layers.
08 - Using a sharp knife, carefully cut through all layers to create diamond or square shapes. This scoring allows for even syrup absorption and makes serving easier after baking.
09 - Bake for 35-40 minutes until the phyllo turns a deep golden brown and becomes crisp throughout. The top should be evenly browned and the layers visibly separated.
10 - While the baklava bakes, combine the syrup sugar, water, and fresh lemon juice in a medium saucepan. Bring to a boil and cook for 8-10 minutes until the sugar completely dissolves. Remove from heat and stir in the honey and rose water or orange blossom water if using.
11 - Immediately upon removing the baklava from the oven, slowly pour the hot syrup evenly over the hot pastry. Allow the baklava to cool completely in the pan so the syrup absorbs fully before serving.