1. Start by whipping the heavy cream in a large bowl until soft peaks form. This should take about 3-4 minutes. Set aside.
2. In another bowl, beat the mascarpone cheese, sugar, vanilla extract, and a pinch of salt until smooth and creamy.
3. Gently fold the whipped cream into the mascarpone mixture until combined. Be careful not to deflate the cream.
4. In a shallow dish, mix the brewed espresso and coffee liqueur. Dip each ladyfinger briefly into the mixture, ensuring they’re moist but not soggy.
5. Layer the bottom of each serving cup with a few soaked ladyfinger pieces. Top with a spoonful of the mascarpone mixture and a sprinkle of chopped pistachios.
6. Repeat the layering process until the cups are filled, finishing with a layer of mascarpone cream.
7. Dust the tops with cocoa powder and a generous sprinkle of pistachios.
8. Refrigerate the cups for at least 4 hours, or overnight, to let the flavors meld together beautifully.

Remember, patience is key here. Allowing your cups to chill will enhance their flavors, much like how we used to let our family recipes simmer to perfection.