If you want boiled egg/s and you happen to be cooking rice….
Just wash the egg, and put it on top of the cooking rice 10 minutes before you turn off the stove (this is the time when the rice has just absorbed all the water—you wouldn’t want your egg to sink into the rice!). I guarantee you’ll have a hard boiled egg at the end!
TIP (not for the egg, but for the rice!):
Try to take just 3 seconds in putting the egg into the pot of rice. One second for lifting the lid, another for putting in the egg, and another for closing the lid. We don’t want too much heat escaping from the pot!