Combine soy sauce, water, rice vinegar, sugar & wasabi paste in a 1-quart mason jar. Cap jar and shake until all ingredients are combined.
Add hard boiled eggs. Cap jar & refrigerate.
Remove jar occasionally and gently roll around / shake eggs to ensure all of egg sits in soy sauce marinate.
These Soy Sauce Boiled Eggs are ready after sitting for at least 24 - 48 hours. A few days longer - even better!
Eat plain from the jar or slice in half and top with black pepper. Or top with condiments - sriracha sauce or your favorite hot sauce, mustard, more wasabi, toasted sesame seeds, chives or scallions.
Keep eggs stored in fridge in soy sauce mixture and eat within a week.
Notes
To Hard Boil Eggs:
Bring water to a light boil in an appropriate sized pot and gently lower eggs. Maintain simmer and gently boil/simmer for 12 minutes.
Transfer eggs to ice water.
When cool, gently tap & crack bottom & top off egg on a hard surface. Firmly roll egg in hand. Start from bottom of egg, peel egg, taking care to peel under the membrane.