01 - Preheat oven to 350°F. Generously butter a 9x13 inch baking dish.
02 - Combine chopped walnuts, pistachios, almonds, sugar, and cinnamon in a bowl. Mix thoroughly to distribute evenly.
03 - Unroll phyllo dough and keep covered 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 one. Spread half of the remaining nuts over this layer.
07 - Add 4 additional phyllo sheets, buttering each sheet. Sprinkle the final layer of nuts evenly.
08 - Finish with remaining phyllo sheets, buttering each layer thoroughly as you stack.
09 - Using a sharp knife, carefully cut the baklava into diamond or square shapes through all layers.
10 - Bake for 35-40 minutes until layers are golden brown and crisp.
11 - While baklava bakes, combine water, sugar, lemon juice, honey, cinnamon stick, and orange peel in a saucepan. Bring to a boil, then reduce heat and simmer for 10 minutes. Remove cinnamon stick and orange peel. Cool slightly.
12 - Immediately pour warm syrup evenly over hot baklava as soon as it comes out of the oven. Allow to cool completely to ensure full syrup absorption before serving.