Mix 4 tbsp of soy sauce with the honey, chilli flakes and ginger in a small bowl
Add the egg yolks to the bowl, then top up with enough soy sauce to cover the yolks (it's fine if the top of the yolks are slightly poking out)
Refrigerate for minimum 10-12 hours for the same texture, or longer if you prefer firmer yolks
To serve, spoon the marinated egg yolks out with some of the sauce