01 - Preheat your oven to 350°F. Grease a 9x13 inch baking dish with some melted butter.
02 - In a bowl, mix the chopped walnuts, pistachios, almonds, sugar, and cinnamon until well combined.
03 - Unroll the phyllo dough. Keep covered with a damp towel to prevent drying while working.
04 - Layer 8 sheets of phyllo in the prepared dish, brushing each sheet generously with melted butter before adding the next.
05 - Sprinkle about a third of the nut mixture evenly over the phyllo sheets.
06 - Add 4 more sheets of phyllo, brushing each with butter. Spread half of the remaining nuts evenly.
07 - Add 4 more phyllo sheets, buttering each one. Sprinkle the final layer of nuts evenly.
08 - Finish with the remaining phyllo sheets, buttering each layer as you go.
09 - Using a sharp knife, cut the baklava into diamonds or squares before baking.
10 - Bake for 35-40 minutes, until golden and crisp.
11 - Combine water, sugar, lemon juice, honey, cinnamon stick, and orange peel in a pan. Bring to a boil, then simmer for 10 minutes. Remove cinnamon and peel, and let cool slightly.
12 - As soon as the baklava is out of the oven, slowly pour the hot syrup over the entire surface. Let cool completely to absorb the syrup before serving.