1. Combine soy sauce, mirin & water in a zip lock bag. Set aside.
2. Bring a medium saucepan of water to the boil. Carefully add eggs & boil for 6 mins. Remove from saucepan & run cold water over eggs to stop cooking. Once cooled, peel.
3. Add to the soy mixture. Make sure they are fully submerged. Leave to marinate over night in the refrigerator or for at least 4 hours. Tip: tie a rubber band around the bag so eggs stay submerged.
