First of all, will bake the base of the roll.
Zucchini of small diameter cut in half.
One half, without peeling, until set aside, and the other half and the second zucchini clean and grate on a large grater.
Add a pinch of salt, mix and leave for 5 minutes. During this time, the salt will draw out the moisture. Press the grated pulp and pour out the liquid.