Combine the hot water, rice vinegar, soy sauce, chili garlic sauce, and sugar in a container and stir to mix.
Add the peeled hard boiled eggs and make sure they are fully submerged in the liquid.
Seal the container and refrigerate for at least 2 hours, or ideally overnight, to allow the eggs to soak up the flavors.
Serve the soy sauce eggs with fresh cracked pepper, sesame oil, and pickled red onion, if desired.
