Grate the zucchini on a coarse grater.
Boil water, add vinegar, salt and sugar. Boil the marinade for 1 minute.
Take a sterilized jar, put the grated zucchini in it. Pour the marinade into the jar and sterilize the preparation for 15 minutes. Close the jar with a lid using a seaming machine. Put the jar in a warm place with the lid down for 24 hours.