Prepare the syrup.
Whisk the yoghurt and eggs together thoroughly. Add the flour and bicarbonate of soda and beat in with a wooden spoon.
Heat the oil. Dip a small spoon into cold oil first, then spoon up some dough, and push it off with your finger into the oil. Repeat until the dough is used up. Fry for 2-3 minutes, turning the kaygana over with a ladle until they are golden.