Boil and peel a dozen eggs.
Add the peeled eggs to a clean/sterilized half gallon jar.
Prepare brine by add the water and vinegars as well as the salt to a pot.
Bring to a boil, reduce heat and simmer for 2-3 minutes.
Before pouring over eggs, add the optional peppercorns and red pepper flakes.
Pour brine over eggs. Place lid on jar.
Allow to cool completely to room temperature.
Move to the fridge for at least 7 days before eating to allow the flavor to fully develop.
Store in the fridge for 3-4 months.