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

The foolproof method for perfect hard-boiled eggs

1. Start cold

Place your eggs in a saucepan  without crowding them. Cover them with cold water, with about  3 to 5 cm of water above  the eggs.

2. Heat gently

Heat over medium heat . As soon as the water begins to boil clearly , immediately turn off the heat.

3. Let time do its work

Cover the pan and let the eggs sit in the hot water for  9 to 12 minutes,  depending on their size. For a slightly soft yolk, 9 minutes is sufficient. For a firm yolk, allow up to 12 minutes.

4. Express cooling

Meanwhile, prepare a bowl of iced water (or, failing that, very cold water). Plunge your eggs into it as soon as the resting time is over. This  immediately stops the cooking process , prevents the green ring… and makes peeling easier!

5. Peel without stress

Once cooled ( 5 minutes is enough ), peel your eggs under running cold water to  easily remove the shell .

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