Yesterday I made a marinade using Youzu, which is a citrus soy sauce. I used:
1 cup Youzu
1/2 cup water
2 Tbs kosher salt
2 scallions chopped
10 fresh ginger coins (ginger root peeled/sliced)
3 cloves minced garlic
I marinated for 8 hours, turning once and then dried on a rack in the fridge for 1 hour till tacky.
I smoked for 1 hour at 200 degrees with a small piece of Alder.
It was amazing.
Next time I will try using sake in the marinade.
Original Post
Youzu is a soysauce that has citrus in it and it has a really nice flavor. Most supermarkets carry it in the soy sauce section. For the ginger, get a finger of fresh ginger root, peel it and slice it thinly. Put around 10-12 of these "coins" in. Enjoy!