The best way to prevent a green egg ring is by boiling and cooling the eggs just right. Kazaks says to start with fresh eggs, ...

The University of Illinois Urbana-Champaign says that putting eggs in cold water, bringing them to a boil, and then covering them and letting them stand for at least 12 minutes can banish the risk of ...

If the yolk has a green ring around it, that means you’ve overcooked the egg. The green tinge results from a chemical reaction between the sulfur in the egg white and the hydrogen in the yolk.