Wash the zucchini and grate them, salt them and leave them to release their juice. In the meantime, peel the potatoes and put them to boil.
Once boiled, drain them of the water and mash them. Take balls of the zucchini, squeeze them with your fingers to drain out the water and mix with the potatoes.
Add the spices, flour, egg and stir everything. Shape flat meatballs.