Line two baking trays with baking paper and spread a thin layer of oil. Beat the egg white with the whisks of the hand mixer until stiff. Add approx. 60 g sugar and continue beating for a few minutes.
Mix 65 g sugar, vanillin sugar and starch. Add the mixture and 1 tsp. lemon juice to the beaten egg white and continue beating until the mixture is very firm and shiny. Pour the mixture into a piping bag with a perforated nozzle (12 mm Ø).
Spray 6 circles (approx. 10 cm Ø) spirally onto each sheet. Bake in the preheated oven (electric cooker: 150 °C/ convection oven: 125 °C/ gas: level 1) for 15-20 minutes one after the other until the circles come off the baking paper easily.
Remove and leave to cool on the tray for a few minutes. Dust 1 piece of baking paper with icing sugar, place the omelettes on top with the top down and cover with a damp cloth. Wash, clean and slice the strawberries.
Whip the cream until stiff, pour in 3 tablespoons of sugar. Stir in the remaining lemon juice and zest. Fill cream into a piping bag with a large star-shaped spout. Spray one half of the omelet with cream and spread strawberries on top.
Fold the other half over. Dust with icing sugar. Decorate with lemon peel and lemon corners.