Boil eggs to your preferred doneness, then peel them.
In a bowl, mix miso paste, soy sauce, mirin, and sugar.
Add boiled eggs to the marinade. Add water if needed to ensure eggs are fully submerged.
Cover and refrigerate for at least 4 hours, preferably overnight.
Remove eggs from marinade and slice before serving.
Notes
Boil eggs to your preferred doneness; soft-boiled is traditional.
• Pierce eggshells gently before marinating for better flavor absorption.
• Keep eggs submerged in the marinade for even flavor.
• Marinate for at least 4 hours, but overnight for best results.
• Gently rotate eggs in the marinade for uniform color.