Process the lemon for lemon zest & lemon juice.
Combine condensed milk & sour cream with an egg whip.
Add lemon zest & lemon juice.
Whip the whipping cream with a handheld electric mixer until stiff.
Combine with the rest.
Add the chocolate flakes.
Pour into a freezer approved container (about 750 ml).
Freeze for about 5 hours.