Poke a hole into the wider bottom part of each raw egg with a pin
Bring a medium pot of water to a boil
Add the eggs and boil for 6 ½ minutes
While the eggs boil, prepare an ice bath by mixing ice and water in a large bowl
In a quart jar or other airtight container, combine the tamari, mirin and 1 ½ cups water
Transfer the eggs with a slotted spoon or spider to the ice bath and allow to cool completely, about 5 minutes
Peel the eggs
Place the eggs in the tamari mixture
Use a paper towel to top the jar and cover with a lid
Refrigerate at least 8 hours or overnight
Serve after marinating (eggs will last up to 2 days)
