Whip the whipping cream & the sugar until stiff w/ your handheld electric mixer.
Mix mascarpone w/ 2 tbsp limoncello (w/ a spoon!).
Fold in all the stiff whipped cream.
Take a square bowl.
Line 10-12 ladyfingers on the bottom.
With a teaspoon add some drops of limoncello to each ladyfinger.
Add a generous layer of mascarpone mix (about 50% of the mix).
Add some lemon curd & distribute in a thin layer.
Add another layer of 10-12 ladyfingers.
Add once again limoncello to the ladyfingers w/ a teaspoon.
Add another generous layer of mascarpone mix (all the rest of the mix).
Sprinkle w/ chopped pistacchios.
Store in the fridge for about 24 h.