We Asked An Expert: Here's Exactly How To Boil Eggs For The Best Results - Tasting Table
Briefly

According to Chef Serrano-Bahri, there is a universal tip when it comes to boiling eggs and that's starting them in cold water before bringing to a boil. "This reduces thermal stress on the egg, especially the shells which tend to crack," he said. The chef further added, "This method allows for the eggs to gradually heat up ... and ensures the egg is cooked evenly from edge to center."
He went on to share the most important part of the whole egg boiling process, "The secret to consistently achieving the desired yolk texture is timing." According to Chef Serrano-Bahri, you need about 4-6 minutes for soft-boiled eggs, 7-9 minutes for medium-boiled eggs, and 10-12 minutes for hard-boiled eggs.
Once your timer goes off, pull the eggs out of the boiling water and drop them into an ice bath to keep them from continuing to cook. A trick to help with peeling is to lightly crack the egg on the side your bowl or with a spoon, so water can get between the membrane and the egg.
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