For the most tender, easy-to-peel eggs, use eggs that are a few days old rather than very fresh and transfer them quickly to an ice bath after boiling. For a slightly milder flavor, dilute the marinade with up to an additional 1/4 cup of water, especially if you marinate the eggs longer than overnight. To keep the recipe strictly keto, skip traditional mirin and use only a keto-friendly sweetener to add subtle sweetness without carbs. These eggs pair well with avocado, cucumber slices, leafy green salads, or a simple keto broth with shirataki noodles for a deeply satisfying low-carb meal.