If your eggs have a green ring around the yolk, it means that… see more”

You’ve made hard-boiled eggs for your salad, and then… surprise: a green circle surrounds the yolk. It’s common, but far from tasty. Despite following your instructions exactly, why does this minor inconvenience keep occurring? And, more importantly, how do you avoid it without becoming a Michelin-starred chef? Here are our tips for perfect hard-boiled eggs that taste as delicious as they look.

**The culprit? An unexpected chemical reaction**

That iconic greenish ring isn’t the result of a poor egg or a failed cooking attempt. It’s merely a reaction between the iron in the yolk and the sulfur in the white that results from overcooking. The outcome is a thin layer of iron sulfide, which is nontoxic but visually unattractive. Fortunately, a few changes are sufficient to eliminate this issue.

**The surefire way to make flawless hard-boiled eggs**

* **Begin with cold water.**
Place the eggs in a pot without crowding them. Cover the eggs with cold water, leaving about 3 to 5 cm of water over them.