Anyone can make a hard-boiled egg, the yolk breaks and sticks to the tongue as powder. But for boiled egg which will have a nice appearance and taste you should be well prepared and timed.
How to prepare perfect hard-boiled egg?
Regardless of how many eggs you will cook, always use a pot which is large enough for all the eggs, without being touched. But that does not mean to use very large pot where the eggs would move freely.
Fill the pot with as much water as needed for the eggs to be immersed. Allow the water to boil. Once it begins to boil, put the eggs one at a time using a spoon. Be careful not to break them.
Boil the eggs precisely for 8 minutes. Then remove them from the heat and pour cold water running over them. This will end the process of their cooking.