Boil fresh raw pistachios in water for 4-5 minutes, drain, and peel off the skins. Blend with a splash of water until smooth to create pistachio paste.

Preheat your oven to 325°F (163°C). Combine graham cracker crumbs, sugar, and melted butter in a mixing bowl, press into a greased 9-inch springform pan. Bake for 8-10 minutes until golden.

Reduce oven to 300°F (148°C). Beat softened cream cheese until smooth, incorporate sugar and flour, then add sour cream, vanilla, and eggs. Pour over cooled crust.

Wrap the springform pan in foil, place in a larger pan, fill with hot water, and bake for 85-95 minutes until the center is set. Cool gradually with the oven door ajar.

Melt white chocolate chips with heavy cream in a saucepan, stirring continuously. Remove from heat and stir in pistachio paste for flavor.

Pour the ganache over the cooled cheesecake, refrigerate for at least 2 hours. Slice and serve.