01 -
Combine water and butter in a saucepan and bring to a boil. Add flour and salt, stirring until the mixture forms a ball and pulls away from the pan sides.
02 -
Let the dough cool slightly. Add eggs one at a time, mixing well after each addition.
03 -
Pipe the dough onto a baking sheet. Bake at 220°C (425°F) for 10 minutes, then reduce the temperature and bake until golden.
04 -
Whip mascarpone, heavy cream, powdered sugar, limoncello, lemon zest, and vanilla extract together until soft peaks form.
05 -
Cut a small slit into each cooled profiterole and fill with the mascarpone cream.
06 -
Dust filled profiteroles with powdered sugar before serving.