What does the green circle around the eggs mean?

actually has a much simpler explanation than it seems…

Why does a green circle appear around the egg yolk?

That’s often when doubt creeps in: the greenish ring can look suspicious. However, it is neither a freshness issue nor a specific problem. This phenomenon is simply related to the cooking process.

When an egg is exposed to heat for too long, a natural reaction occurs between the elements in the egg white and the yolk. The result: this thin greenish layer appears around the yolk.

Good news: this doesn’t affect