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Why does a green ring appear around hard-boiled eggs?

You’ve just made a batch of hard-boiled eggs for your salad, and then you spot it: a green circle around the yolk. It’s a common sight and can ruin your appetite, even when you’ve followed all the instructions closely. So, why does this happen, and what’s the best way to prevent it—without needing the skills of a Michelin chef? Here’s how to get perfectly cooked, delicious-looking eggs every time.

Why Do Hard-Boiled Eggs Get a Green Ring?

The green ring is not a sign of a bad egg or a cooking disaster. It’s simply a chemical reaction. When eggs are overcooked, iron in the yolk reacts with sulfur in the white, creating a thin layer of iron sulfide. This greenish layer is harmless, but not very appetizing. The good news is that it’s easy to avoid with a few simple tweaks.

Step-by-Step: The Best Method for Hard-Boiled Eggs

1. Start with Cold Water

Place your eggs in a pot, making sure not to crowd them. Cover the eggs with cold water so there’s about 1 to 2 inches (about 3 to 5 centimeters) above them.

2. Heat Gradually

Put the pot on the stove and turn the heat to medium. As soon as the water comes to a clear boil, turn off the heat right away.

3. Let Them Rest

Cover the pot with a lid and let the eggs sit in the hot water for 9 to 12 minutes. For a softer yolk, use 9 minutes. For a fully firm yolk, let them rest for up to 12 minutes. The size of the eggs may affect timing slightly.

4. Cool Down Quickly

While the eggs are resting, fill a large bowl with ice water or very cold water. When time is up, transfer the eggs into the ice water. This stops the cooking process instantly, prevents the green ring, and also makes peeling much easier.

5. Easy Peeling

After about 5 minutes in the cold water, peel the eggs under running cold water. This helps the shell slip off more easily and leaves the surface smooth.

Extra Tips for the Best Hard-Boiled Eggs

  • Use eggs that are a little less fresh—about 5 to 7 days old. Super fresh eggs can be harder to peel.

  • Add a sprinkle of salt or a splash of vinegar to the cooking water to help prevent cracking if a shell breaks.

  • Store hard-boiled eggs in their shells in the fridge for up to a week. Once peeled, eat them within 2 or 3 days for the best flavor and texture.

The Simple Secret

The key to perfect hard-boiled eggs? Just the right timing. Don’t overcook them, and always chill them immediately after cooking. With these easy steps, you’ll get eggs that look as good as they taste—every single time.

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