In a flat-bottom, airtight contianer, combine equal parts soy sauce & mirin
Separate egg yolks from whites
Gently plop egg yolks in the mix. If egg yolks aren't fully submerged, cover with a clean paper towel or cheese cloth – the liquid will absorb over the yolks, essentially covering them so they cure evenly (so no need to use up half your bottles of soy sauce & mirin !). Alternatively, you can flip the yolks every 6-12 hours
Store in fridge for at least 6 hours (see notes below).
Remove paper towel and serve with whatever your lil <3 desires. some personal favs have been on top of congee, pasta (melts into a rich, thick kinda pasta sauce), or - my go to easy meal as of recent - a plain bowl of rice