01 - Preheat oven to 340°F. Generously grease a 9x13-inch baking dish with melted butter.
02 - Combine walnuts, pistachios, almonds, cinnamon, cloves, and sugar in a mixing bowl. Stir until evenly distributed.
03 - Unroll phyllo sheets and cover immediately with a damp kitchen towel to prevent drying and cracking.
04 - Place one phyllo sheet in the prepared dish and brush lightly with melted butter. Repeat with 7 more sheets, buttering each layer.
05 - Spread one-third of the nut mixture evenly across the buttered phyllo base.
06 - Layer 4 more phyllo sheets, brushing each with butter. Sprinkle another third of the nut mixture on top.
07 - Add 4 additional buttered phyllo sheets. Spread the remaining nut mixture evenly over the surface.
08 - Complete with the final 4 phyllo sheets, buttering each layer thoroughly. Generously butter the top surface.
09 - Using a sharp knife, carefully cut the assembled baklava into diamonds or squares before baking.
10 - Bake for 45-50 minutes until layers turn golden brown and become crisp.
11 - While baklava bakes, combine sugar, water, honey, cinnamon stick, and lemon peel in a saucepan. Bring to boil, then simmer 10 minutes. Remove from heat and cool slightly. Discard cinnamon and peel.
12 - Immediately pour warm syrup evenly over the hot baklava upon removal from oven. Allow to cool completely before serving.