Hard-boiled eggs: why this green ring appears and how to avoid it with the right cooking technique

Perfect hard-boiled eggs or an unsightly greenish ring? This common phenomenon intrigues many cooks. The discoloration around the yolk is not a matter of freshness, but of cooking technique. A simple method allows you to consistently obtain eggs with a perfectly golden yolk, without that undesirable border that puts off so many gourmets.

That greenish ring that appears around the hard-boiled egg yolk…