Prepare a 9-inch springform pan with parchment paper, and preheat an oven to 180c (350f). In a small mixing bowl, add the chopped pistachios, walnuts, sugar, vanilla extract, and cinnamon, and mix until well combined.
Brush the bottom of the parchment paper lined pan with a thin layer of melted butter.
Layer 5 sheets of phyllo sheets into the pan allowing the sides to hang over the edges. Brush the dough generously with melted butter.
Sprinkle about two tablespoons of the nut mixture on the dough evenly.
Top the nuts with another 3 layers of phyllo sheets, brush it with butter, and repeat, do this 3 more times, and finally top it with another 4 sheets of phyllo sheets, and brush them with butter.
In a large mixing bowl, add the softened cream cheese, lemon zest vanilla extract, sugar, lemon juice, sour cream and mix with an electric hand mixer until is creamy. Whisk the eggs in a small bowl add them to the cheesecake mixture and mix until the mixture is smooth. Sift the cornstarch into the mixture and mix until combined and there are no lumps of cornstarch showing. Do not overmix the batter. Pour the cheesecake filling over the phyllo crust.
Fold over the phyllo dough that is hanging out of the pan and brush it with the leftover melted butter.
Bake it in a 140c (280f) preheated oven for about an hour or until the edges of the cheesecake are set, but the middle is a bit jiggly and the phyllo dough is golden brown.
While the cheesecake is baking, make the honey syrup. In a medium saucepan, add the sugar, honey, water, vanilla extract, and lemon juice and cook over medium-high heat mixing constantly until the sugar melts.
Then reduce the heat to medium-low, and simmer for another 4 minutes. Remove from the heat and let it cool.
As soon as the cheesecake comes out of the oven, pour the honey syrup over the baked phyllo dough and let it chill in the fridge for at least 5 hours to allow the cheesecake to set.
Garnish with chopped pistachios and serve!