Flourless Pistachio Cake with Chocolate Ganache

Serve the pistachio cake at room temperature, either on its own or with a dollop of whipped cream or fresh berries.
Leftovers can be stored in an airtight container at room temperature for up to 3 days, or in the refrigerator for up to 5 days.
Variations:

Add a touch of orange zest or a splash of orange liqueur to the pistachio cake batter for a citrusy twist.
For a lighter ganache, use milk chocolate instead of dark chocolate.
Top the cake with crushed pistachios or a sprinkle of sea salt for added texture and flavor.
FAQ:

Can I make this cake ahead of time? Yes, this cake can be baked a day ahead of time. Just store it at room temperature and add the ganache before serving.

Can I freeze this cake? Yes, you can freeze the pistachio cake without the ganache for up to 2 months. Thaw it in the refrigerator overnight and add the ganache before serving.