Fruit Omelette

Ingredients
4 eggs
2 tablespoons flour
butter for greasing
150 g strawberries or wild strawberries, or other fruits (I apply red currents)
50 g butter
5 tablespoons powdered sugar
vanilla sugar for dusting

Preparation method
Separate the egg whites from the egg yolks.Whisk the egg whites until stiff, add sugar and whisk again for a while. Add the egg yolks one tablespoon at a time and stir. Combine with the sifted flour. Line a baking pan (40 cm x 28 cm)  with baking paper and grease it. Pour the mixture into the prepared pan. Preheat the oven to 150 degrees C. Bake for 10 minutes. Put the omelette on a linen cloth. Remove the baking paper. Roll up the cloth and the warm omelette together into a spiral. Beat the butter until it is creamy. Add sugar and red currants. Blend until it is completely smooth. Unroll the omelette. Spread the filling on it. Roll the omelette once again. Dust with vanilla sugar.