Making this wonderful Pistachio Tiramisu is simple when you follow these easy steps:

1. Prepare the Coffee Mixture: In a bowl, combine the cooled brewed coffee with the coffee liqueur, if using. Set aside.
2. Make the Pistachio Cream: In another bowl, beat the mascarpone cheese until smooth. Add the granulated sugar and vanilla extract, mixing well to combine.
3. Whip the Cream: In a separate bowl, whip the heavy cream until stiff peaks form. Gently fold the whipped cream into the mascarpone mixture until fully incorporated.
4. Dip the Ladyfingers: Quickly dip each ladyfinger into the coffee mixture, ensuring they are soaked but not soggy.
5. Layer the Dessert: In a 9×9-inch dish, create a layer of soaked ladyfingers at the bottom. Spread half of the pistachio cream over the cookies.
6. Add More Layers: Repeat the process by adding another layer of dipped ladyfingers followed by the remaining pistachio cream on top.
7. Chill: Cover the dish with plastic wrap and refrigerate for 4-6 hours, allowing the flavors to meld beautifully.
8. Serve: Before serving, garnish the top with additional crushed pistachios for a delightful crunch and visual appeal.

By following these straightforward steps, you'll create a delicious Pistachio Tiramisu that will dazzle anyone who takes a bite.