Separate 1 egg. Chill the egg white. Beat 1 egg, 3 egg yolks, sugar and lemon peel in a hot water bath with the whisks of the hand mixer for about 7 minutes until white and creamy. Add wine and lemon juice and continue beating until the cream volume has doubled.
Then beat the cream on a cold water bath until cold. Beat the egg whites and salt until stiff and carefully fold into the cream. Pour the cream into dessert glasses. Crumble the biscuits finely and sprinkle over the top.
Dust with icing sugar.