There are 3 levels @ Toyonchi no Tamago.
This Ohran ( 王卵）is the best and their recommendation. You can see this orange egg yolk.
I had this with fried minced meat / chopped burdock. ( coarsely chop washed burdock.
Cook chopped ginger, meat and burdock in heated olive oil/ pan. Add pinch of salt, 1 tea spoon of soy sauce and sugar. Maybe you can use Mentsuyu ( soba noodle soup) or add mirin . )