01 - Preheat your oven to 350°F. Generously grease a 9x13 inch baking dish with melted butter.
02 - Combine the chopped walnuts, pistachios, almonds, sugar, and cinnamon in a mixing bowl. Toss until evenly blended.
03 - Unroll the phyllo dough and cover with a damp kitchen towel to prevent drying out while you work.
04 - Layer 8 sheets of phyllo in the prepared dish, brushing each sheet thoroughly with melted butter before adding the next.
05 - Sprinkle approximately one-third of the nut mixture evenly over the phyllo base.
06 - Add 4 more sheets of phyllo, brushing each with butter. Spread half of the remaining nut mixture over this layer.
07 - Place 4 additional phyllo sheets, buttering each one. Sprinkle the remaining nut mixture evenly across the surface.
08 - Finish with the remaining phyllo sheets, brushing each layer with butter as you stack them.
09 - Using a sharp knife, carefully cut the layered pastry into diamond or square shapes before baking.
10 - Bake for 35-40 minutes until the phyllo turns golden brown and achieves a crisp texture.
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; allow syrup to cool slightly.
12 - Immediately upon removing the baklava from the oven, slowly pour the warm syrup over the entire surface. Allow to cool completely so the pastry can fully absorb the syrup before serving.