Mix the egg yolks with
the sugar and the lemon rind and juice and beat a few minutes. Heat
au bain marie or in the microwave (30 seconds at a time, stir in between)
until it becomes thick. Don't cook! When the sauce is thick, add the
butter. Allow to cool down. Add the limoncello and stir. Beat the egg
whites until fluffy and fold them into the lemon mixture. Serve in glasses.
This recipe originates from the
Amalfi coast in the province
Palermo, in the Campania region of Italy, where you will find an abundance
of citrus trees.