Mix all ingrdients EXCEPT sesame seeds to form a dough and knead by hand for approximately 10 minutes.
You might need to add a little more flour, the dough should be soft but not sticky.
Cover and let dough rise for about 30-50 minutes or until dough has doubled in size.
Meanwhile preheat oven (440°F, 225°C) and grease baking tray or cover it with baking paper. Put a wide ovenproof dish filled with hot water on the bottom of the oven to have steam, which will make for a better result.
Knead dough a second time and divide into 8 portions.
Form each part into 13-14 inch long roll (about 3/4-1 inch thick). Shape into rings and press ends together.
Put some warm water into a large bowl. Put sesame seeds on a plate.
Carefully dip rings into warm water and then into sesame seeds to cover them on both sides.
Put rings on baking tray and let rise for another 10 minutes.
Bake for about 25-35 minutes.
Koulóuria are done, when they are golden brown. Remove from oven and let cool completely.