01 - Preheat your oven to 350°F. Generously grease a 9x13 inch baking dish with some melted butter.
02 - Combine the chopped walnuts, pistachios, almonds, sugar, and cinnamon in a medium bowl. Mix thoroughly to distribute spices evenly.
03 - Unroll the phyllo dough and cover immediately with a damp kitchen towel to prevent drying out while working.
04 - Place 8 sheets of phyllo in the prepared dish, brushing each sheet generously with melted butter before adding the next sheet.
05 - Sprinkle approximately one-third of the nut mixture evenly over the phyllo base.
06 - Add 4 more sheets of phyllo, brushing each sheet with butter. Spread half of the remaining nuts over this layer.
07 - Place 4 additional phyllo sheets, buttering each one. Sprinkle the remaining nut mixture over the top.
08 - Finish with the remaining phyllo sheets, buttering each layer thoroughly as you stack them.
09 - Using a sharp knife, cut the baklava into diamond or square shapes before baking. Cut completely through all layers.
10 - Bake for 35-40 minutes until the phyllo turns golden brown and becomes crisp throughout.
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, let syrup cool slightly.
12 - Immediately after removing baklava from the oven, slowly pour the warm syrup evenly over the entire surface. Allow to cool completely for several hours so the syrup absorbs fully before serving.