How to ensure that eggs get hard boiled on a gas stove?

Question

I used to determine the state of eggs by their shell i.e. if the shell is cracked, the eggs have been boiled. But sometimes I have found that even though the shell is cracked, the egg whites are somewhat runny!

Is there a special way of boiling eggs on "gas stove"? Is it necessary to cover them while boiling?

Answer

I agree with @jwenting, 5-7 minutes in boiling water is the way to go. Remember to always put the eggs in cold water, if you put them in hot water you risk cracking the shell, especially if eggs are cold.

Also, to avoid premature cracking of the shell, that may leave some egg white leaking out, add a spoon of vinegar (should work with lemon juice too) to the water.

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