Beat the egg yolks with sugar. Beat the egg whites separately. Carefully mix the mascarpone cheese with the beaten egg yolks, then add the beaten egg whites into the mixture. Mix juice and add liqueur.
Dip the biscuits into the juice-liqueur mixture and cover the bottom of the dish with a thick layer of biscuits. Pour the mascarpone mixture on top of the biscuits. Place in refrigerator to set for at least 2 hours.
Sprinkle the finely crushed lemon candies on top before serving.