In a large bowl mix flour, yeast, salt, and sugar.
Add egg yolks and slowly drizzle in the water while mixing by hand.
Keep kneading the dough until a sticky, smooth and soft dough has formed.
Spray the dough with some oil spray and cover the bowl with a plastic wrap or a plastic bag.
Let the dough rise for about 1-2 hours.
Grease a large cookie sheet with some vegetable oil set aside.
Divide the dough into 15 parts, roll each piece into a ball and place it on the greased cookie sheet.
Cover the dough balls with a lightly damp kitchen towel for a second rise, about 30-60 minutes.
Pour the vegetable oil into a wide and deep pan, about 1/3-1/2 way up. Heat it to 340F-400F.
Using your finger and thumb create a hole in the center of each dough ball and place it into the hot oil.
Fry for about 3 minutes on each size.
The donuts are ready when lightly golden.
Sprinkle the donuts with some sugar or honey and serve immediately.