Whisk together egg yolks and sugar until foamy.
Add mascarpone cheese and mix until smooth.
Add lemon zest and lemon juice.
Beat egg whites into a meringue and fold into the cheese mixture.
Soak ladyfingers in lemon juice with a little sugar.
Layer ladyfingers and cheese cream in a container.
Chill in the refrigerator for at least 2 hours.
Garnish with lemon zest to finish.