Rinse and pat dry the walnuts. Cut them into quarters with a sharp chef's knife or cleaver.
Put the walnuts, spices, zest, sugar, and vodka into a large glass container. The vodka should cover the walnuts. Cover and shake to mix well.
Store for 6 weeks, shaking daily: As the days go by you will notice that the color of the nocino gets darker and darker.
When bottling, sterilize bottles than strain through cheese cloth to remove solids. Cork tightly. Best a year after it was first bottled