Many ways to boil an egg, but the best method I've found is to just steam them in the rice cooker steamer. I can fit 10 eggs per tray. This would be good for boiling/steaming large number of egg. As I simply cook dinner in the rice cooker pot, the egg can go on the steamer for automatic hard boiled egg. No timer necessary. I store them in white vinegar. Supposedly, you should mix 50/50 with water, add a cup of salt, and boil the solution. I simply use straight 5% solution, as it is more of a short term preservation technique for me.