2. But why do hard-boiled eggs develop a green crust around the yolk? (and how to prevent it)

²Start with cold water
Place the eggs in a saucepan and cover them with cold water, about 2–3 cm above the eggs.

Gently heat
Bring the water to a boil over medium heat. As soon as it boils, turn off the heat immediately.

Let stand (without boiling again)
Cover the pan with a lid and let the eggs stand in the hot water:

9 minutes for slightly creamy yolks

12 minutes for fully firm yolks

Cool quickly
Transfer the eggs to a bowl of cold water or ice. This thermal shock stops the cooking process and prevents the yolks from turning green.

Easily peel
After 5 minutes in the cold water, gently tap the shell and peel them under running water. Eggs peel much more easily, especially if they are not fresh.

Extra Tips for Perfect Hard-Boiled Eggs
Use eggs that are 5 to 7 days old: very fresh eggs are difficult to peel, while slightly older ones peel more easily.

Add salt or vinegar to the cooking water: this helps prevent cracking and makes peeling easier.

Proper Storage:

With shell: up to 1 week in the refrigerator

Without shell: ideally eaten within 2–3 days

Delicious Ways to Enjoy Your Hard-Boiled Eggs
Once you've mastered the perfect cooking method, you can use them in many ways:

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Chopped in salads or mixed with potatoes

As a base for deviled eggs with mayonnaise and a touch of paprika

Grated on toast with avocado

In sandwiches or wraps for a quick and nutritious meal

Conclusion: The green ring around the yolk may look unappealing, but it's perfectly safe. With a little attention to timing and cooling, you can easily avoid this and enjoy hard-boiled eggs with golden yolks and soft whites.

Next time you make them, don't guess the timing: follow these steps and enjoy perfect results every time.
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