- Bring a pot of water to a boil. Once boiling, carefully lower in the eggs and cook for exactly 6.5 to 7 minutes. 
- Transfer the eggs immediately into an ice bath to stop the cooking. Let them sit for 10 minutes. 
- Meanwhile, mix the soy sauce, mirin, water, and sugar in a bowl or zip-top bag. Stir until sugar dissolves. Add optional aromatics if using. 
- Peel the cooled eggs gently. Place them into the marinade, making sure they’re submerged. 
- Marinate for at least 4 hours in the fridge, or overnight for deeper flavor. 
- Slice in half and serve with ramen, salads, rice bowls, or eat as-is.