For biscotti, first preheat the oven to 180 °C top and bottom heat (convection oven: 160 °C). Line several baking sheets with baking paper.
Separate the eggs. Beat egg yolks with 75 g sugar and water until creamy. Beat egg whites with remaining sugar and salt until stiff.
Stir half of the egg whites into the yolk-sugar cream. Sift flour and cornstarch and fold into yolk mixture alternately with remaining whipped cream.
Fill the sponge cake into a piping bag with a smooth nozzle. Now pipe sticks about 6 cm long and 3 cm wide onto the prepared baking sheets, spacing them sufficiently apart.
Bake in the hot oven on the 2nd rack from the bottom for approx. 12-15 minutes until golden brown.
Remove the biscuits from the oven, allow to cool and sprinkle with powdered sugar to taste.
Preparation Tip:
Homemade sponge cake tastes wonderful in tiramisu, for example: Here you will find delicious recipe ideas for tiramisu!