Ingredients :

1. Preheat the oven to 220 ° C (thermostat 7-8). Separate the white from the egg yolks. Put the 3 white ones in a salad bowl with the pinch of salt and mount them in very firm snow. 2. In another bowl, whisk 3 yolks with 3 whole eggs. Add the powdered sugar and the vanilla sugar, make the sparkling mixture with the whisk. Add the whites lightly in snow without breaking them, then add the flour to rain and mix well. 3. On a baking sheet covered with greaseproof paper, pour the dough over a 1 cm thick rectangle. Bake 15 to 20 minutes. When you leave the oven, turn the biscuit over a slightly damp cloth. With a sharp knife cut all the edges all around, it will facilitate the "rolling". Let cool for a few moments, then spread the biscuit with the spread. Roll the biscuit tightly, put it on a plate and put in the cool. 4. When serving, sprinkle the cake with icing sugar through a fine colander.