Because Japan is Volcano Islands, there are hot springs (Onsen in Japanese) everywhere in Japan. Hot springs heals people, it is well known as place where you can disconnect yourself from the real life and relax.
An egg boiled in Onsen is called Onsen Tamago (Hot spring eggs in Japanese).
Onsen eggs are half boiled egg, it’s delicious! Japanese style inn called Ryokan often has Onsen Tamago as their menu.
Would you like to try them?