Start by preheating your oven to 350°F (175°C). In a mixing bowl, combine the crushed vanilla wafers, melted butter, brown sugar, orange zest, and a pinch of sea salt. Stir until fully combined. Next, press this mixture firmly into the bottom of a 9-inch springform pan. Make sure it's even; this crust will be the foundation of your cheesecake. Bake for about 8-10 minutes, or until lightly golden. Let it cool while you prepare the filling.

In a large mixing bowl, beat the softened cream cheese until creamy and smooth—approximately 2-3 minutes with an electric mixer. Gradually add the sugar and mix until combined. Next, beat in the sour cream until well incorporated. Add the pistachio butter and mix again. One by one, add the eggs, mixing on low speed after each addition. Be careful not to over-mix. Now, add the flour, pistachio extract, and rose water (if using). Mix until just combined. If you're feeling adventurous, add a few drops of green food coloring for a pop of color.

Carefully pour the filling over the cooled crust in the springform pan. Bake for about 50-60 minutes or until the edges look set, but the center remains slightly jiggly. This jiggle is crucial; the cheesecake will continue to set as it cools. Once baked, turn off the oven and leave the cheesecake inside with the door ajar for about an hour. This helps prevent cracks.

In a mixing bowl, combine the sour cream and sugar. Spread this mixture over the cooled cheesecake. It adds creaminess and balances the richness of the cake. Chill in the refrigerator for at least 4 hours or preferably overnight.

Before serving, sprinkle the chopped roasted pistachios on top and a pinch of salt. Carefully remove the sides of the springform pan. Slice, serve, and witness the smiles as they take their first bites!