Holding Yolk for Piercing: I prepared my egg yolks in two ways. The first, for which I have no photos, involves separating the yolk and rolling it around on a paper towel to remove all traces of white. I then carefully rolled the yolk to the edge of the towel and pierced it over the holding container. The second method involves leaving the separated yolk uncovered in the refrigerator overnight. This dried out the yolk’s sac and allowed me to pick up it with my fingers and pierce it over the container. More talented people can pick up a fresh yolk in the same way, "like a mother cat picks up a kitten."