Are hard boiled eggs supposed to have a runny yolk?

A hard-boiled egg is cooked long enough that the yolk is completely solid and firm, just like the white. If the yolk is still runny, the egg was not boiled for long enough.

Here's a breakdown of the different levels of egg doneness:

* Soft-boiled: The white is solid, but the yolk is still runny.

* Medium-boiled: The white is solid, and the yolk is partially set, but still has a soft center.

* Hard-boiled: The white and yolk are both solid and firm.