Use a medium size pot and add water (there should be enough to cover the eggs). Turn the heat to medium.
After boiling the water, add eggs from the fridge and boil for 8 minutes.*1
After boiling the eggs, turn the heat off and put the pot in the sink and run the eggs under cold water for about 2 minutes. Soaking in cold water helps for removing the Egg shells.
Remove the shells.
For making ramen egg
Use a small pot and heat on medium. Add mirin to the pot and boil to allow the alcohol to evaporate. After boiling for 1 minute, turn the heat off and let it cool down. You don't need to cool down completely, just cool enough to safely add to a Ziplock bag.
Use a medium size Ziplock and add boiled eggs, soysauce, boiledmirin, sugar, and water.
Remove all air when you close the bag.
Put in the fridge for 2 hours.
After 2 hours, take the eggs out from the fridge and cut down the middle! You can use a knife but I recommend using a string for a cleaner cut.
Let's serve! You can use it as topping on Ramen, or people just eat as a side dish!
Notes
*1 If you prefer not to have soft boiled eggs, then boil 11-12 minutes.