Mix graham cracker crumbs with melted butter until well combined and crumbly.
Press the crumb mixture evenly into the bottom of a springform pan, creating a firm crust. Chill in the fridge for 15 minutes to set.
In a large bowl, beat softened cream cheese and sugar with an electric mixer on medium speed until smooth and creamy, about 2-3 minutes.
Add eggs one at a time, mixing well after each addition to incorporate fully.
Fold in sour cream, lemon zest, and crushed cardamom with a spatula until evenly distributed and the mixture is smooth.
Pour the filling over the chilled crust, smoothing the top with a spatula.
Bake in a preheated oven at 160°C (320°F) for 50-60 minutes, until the edges are lightly browned and the center has a slight jiggle.
Turn off the oven, crack the door open slightly, and let the cheesecake cool inside for 1 hour to prevent cracks.
Remove the cheesecake from the oven and refrigerate for at least 4 hours or overnight to set completely.
Before serving, garnish the top with thin lemon slices and a sprinkle of crushed pistachios for color and flavor.
Slice and enjoy this bright, creamy cheesecake with its fragrant lemon and floral cardamom notes.