Form a dough with water and durum wheat semolina
Form a cord of half a centimeter in diameter. Cut the cord into pieces of about one centimeter (two centimeters if you want larger gnocchi).
Lay each piece on a ruled surface or on the inside of the grater, and with the thumb, impart a quick rotary movement that will wrap it on itself.
Alternatively you can use a manual machinery on the market for several years.