01 - Preheat oven to 350°F. Generously butter a 9x13 inch baking dish.
02 - In a large bowl, combine walnuts, pistachios, almonds, sugar, and cinnamon. Mix thoroughly until evenly distributed.
03 - Unroll phyllo dough and cover completely with a damp kitchen towel to prevent drying out during assembly.
04 - Place 8 sheets of phyllo in the prepared dish, brushing each sheet generously with melted butter before adding the next.
05 - Sprinkle approximately one-third of the nut mixture evenly over the phyllo base.
06 - Layer 4 more phyllo sheets, buttering each individually. Spread half of the remaining nuts over the surface.
07 - Place 4 more phyllo sheets, buttering each layer. Sprinkle the remaining nut mixture evenly.
08 - Finish with remaining phyllo sheets, brushing each sheet thoroughly with melted butter as you layer.
09 - Using a sharp knife, carefully cut through all layers to form diamond or square shapes before baking.
10 - Bake for 35-40 minutes until deeply golden and crisp throughout.
11 - While baklava bakes, combine water, sugar, lemon juice, honey, cinnamon stick, and orange peel in a saucepan. Bring to boil, then reduce heat and simmer for 10 minutes. Remove cinnamon stick and orange peel, allow syrup to cool slightly.
12 - Immediately pour the warm syrup evenly over the hot baklava. Let cool completely at room temperature to allow full syrup absorption before serving.