How to Make It
To ferment the blueberries, add yeast with ½ cup water to blueberries and mix together well. Place in a large (at least 6-cup) plastic container, press plastic wrap directly on top of the fruit, then cover with a lid and ferment in the refrigerator for 1 week.
Combine dry ingredients and spread a thin layer of the mixture, about ¼ inch, into a shallow container big enough to hold the yolks without crowding them. Using the back of a spoon, press a small nest for each yolk.