how to cook perfect hard-boiled egg
Place eggs in a large saucepan. Cover them with cool water by 1 inch. Cover with a lid and bring water to a boil over high heat; when the water has reached a boil, set the timer for the desired time. Boil for 6 - 7 minutes for perfect hard boiled eggs. For soft-boiled eggs: 4 minutes. For slightly soft-boiled eggs: 5 minutes. For custardy yet firm soft-boiled eggs: 6 minutes.