Never have a green, overdone yolk again when you hard-boil your eggs. Achieve a uniform yellow throughout your yolk by taking the eggs off the heat the second the water starts boiling. So, even though they're called "hard-boiled" eggs, they never really get boiled. Geoffrey Zakarian also pierces a tiny hole into his eggs before he boils them, which makes a world of difference when it comes time to peeling.
Use a needle to pierce a small hole into each egg.2.
Place the eggs in a pot with the vinegar, and enough water to cover by 1 inch.3.
Bring the eggs to a boil and then turn off the heat and cover. Set a timer to 6 minutes for soft, 8 minutes for medium, and 10 minutes for perfectly cooked-through eggs.