Preheat the oven to 390°F
In your mixer bowl add 6 eggs. Then separate the other 4 eggs and only use the yolk. So in your mixing bowl you'll have 10 yolks but only 6 whites. (I save the 4 whites in the fridge for breakfast the next day).
Add the 250 grams of sugar and mix on high for 6 minutes.
Add the 300 grams of flour and fold it into the mix.
Add parchment paper on both cookie sheets. Separate half of the dough onto each cookie sheet.
Smooth out the dough and then sprinkle with shredded chocolate. Save a couple Tbsp to sprinkle on the top of the finished rolls.
Bake for less than 10 minutes until only golden. You can bake them one at a time or together.
Remove and flip onto kitchen towel. Cool slightly and gently remove the parchment paper.
Starting on the long side roll up the cake and set it on a wire rack to cool completely with the seam side down. Do this before it cools to prevent cracking when rolling it back up with the filling.