Ingredients: 

• 4 eggs 
• ¼ cup soy sauce
• ¼ cup mirin
• ¼ cup sake
• 1 tsp sugar

1. While eggs boil (boil for 6 ½ min) bring marinade to a boil, whisk, and lower heat for 1 min. Set to the side and let cool completely. 
2. Add marinade into a plastic bag or container and add eggs. Lasts for up to 1 week. You can add water to the marinade if it’s not enough liquid but the egg won’t be as flavorful.