Creamy, ultra-smooth pistachio cheesecake on a crunchy pistachio–graham crust, gently baked in a water bath and finished with a shower of chopped pistachios.
Heat oven to 325 F. Grease a 9 inch springform pan, line the bottom with parchment, and wrap the outside of the pan with 2 to 3 layers of heavy-duty foil.
Make the crust: In a bowl, combine graham cracker crumbs, finely ground pistachios, sugar, and salt. Stir in melted butter until the mixture resembles damp sand.
Press the crust firmly into the bottom of the pan. Bake for 10 minutes, then set aside to cool slightly while you make the filling.
Bring a kettle of water to a boil for the water bath. Set a large roasting pan on the oven rack.
Beat cream cheese and sugar on medium speed until creamy and smooth, 2 to 3 minutes, scraping the bowl as needed.
Mix in sour cream, pistachio paste, heavy cream, vanilla, almond extract, salt, and lemon zest on low speed until just combined and silky.
Add eggs one at a time on low speed, mixing just until incorporated after each addition. Do not overmix. Tap the bowl gently to release air bubbles.
Pour the filling over the crust. Set the springform pan inside the roasting pan and carefully pour hot water into the roasting pan until it reaches halfway up the sides of the springform.
Bake 55 to 65 minutes until the edges are set and the center wobbles slightly when jiggled.
Turn off the oven, crack the door, and let the cheesecake rest inside for 45 minutes. Remove from the water bath, unwrap the foil, and run a thin knife around the edge.
Cool to room temperature, then cover and chill at least 6 hours or overnight until fully set.
Unmold, top with chopped pistachios, slice with a warm knife, and serve.
Notes
For a watertight seal, use extra-wide heavy-duty foil around the pan or place the springform inside a slightly larger cake pan before setting in the water bath. For clean slices, warm the knife under hot water and wipe between cuts.