01 - Bring a pot of water to a rolling boil
02 - Gently lower the eggs into the boiling water using a spoon. Boil for exactly 7 minutes for a slightly runny yolk
03 - While eggs cook, prepare an ice bath in a bowl
04 - Immediately transfer eggs to the ice bath once cooking time is complete. Let cool for 5 minutes
05 - Carefully peel the cooled eggs, removing all shell fragments
06 - In a zip-top bag or small container, combine soy sauce, water, mirin, and sugar. Stir until sugar completely dissolves
07 - Place peeled eggs in the marinade, ensuring they are fully submerged. Marinate in the refrigerator for at least 4 hours, preferably overnight, turning occasionally for even coloring
08 - Remove eggs from marinade, slice in half, and serve atop ramen or as desired