My simple mixture of miso paste, sake and mirin tenderizes the meat to a point where it almost melts in your mouth. It’s unbelievably effective!
For the marinade:
Miso salmon tastes best right out of the oven. But you can store any leftovers, covered in the refrigerator, for up to 2 days.
Find it online: https://pickledplum.com/miso-salmon/