Follow these simple steps to create your Decadent Pistachio Cheesecake:

1. Preheat Oven: Preheat your oven to 325°F (163°C). Grease a 9-inch springform pan.
2. Make the Crust: In a mixing bowl, combine the graham cracker crumbs and melted butter. Press this mixture firmly into the bottom of the prepared springform pan to form an even layer.
3. Prepare the Filling: In a large bowl, beat the softened cream cheese and sugar together until smooth and creamy.
4. Add Eggs: Add the eggs one at a time, mixing well after each addition.
5. Add Flavorings: Mix in the vanilla extract, lemon juice, and sour cream until smooth.
6. Incorporate Pistachios: Gently fold in the finely chopped pistachios until evenly distributed throughout the batter.
7. Pour into Pan: Pour the cheesecake filling over the prepared crust in the springform pan.
8. Bake: Place the cheesecake in the preheated oven and bake for about 60 minutes, or until the center is set but still slightly jiggly.
9. Cool: Remove the cheesecake from the oven and let it cool at room temperature for about an hour.
10. Chill: Once cooled, cover the cheesecake with plastic wrap and refrigerate for at least 4 hours, or overnight for best results.
11. Prepare Whipped Cream: Before serving, whip the heavy cream until stiff peaks form and spread it over the chilled cheesecake.
12. Garnish: Sprinkle additional chopped pistachios on top for a beautiful finish.