Knead the oil with sugar. Add the egg yolks, stirring constantly and the fresh cream.
Add the flour, baking powder, lemon zest, mixing thoroughly.
Whip the eggs whites until stiff and add them to the mixture from the bottom upwards.
Pour the mixture into small molds, greased and floured.
Bake, in preheated oven, at 180°C (350°F/gas 4), for 30 minutes.
Decorate with icing sugar.