Salmon is a rare treat around here, usually reserved for special occasions and when family comes to visit, but when we do have it, this is hands-down our family's favorite way to eat it. Even those who don't like fish and think all fish is too fishy-tasting cannot resist this. The measurements for the marinade needn't be precise - it's more about the ratios and if you prefer a sweeter marinade or a saltier one. I typically buy a large, whole filet of wild Alaskan salmon and cut it into roughly equal pieces. Marinate them for an hour before cooking. You can grill the fish, or pan fry it in a little peanut oil, which is our preferred method.
For the marinade:
Equal parts organic soy sauce and water
Sugar (to taste)
Sesame oil (a little goes a long way - for a large filet, use a Tablespoon or so)
Lots of minced garlic
Grated fresh ginger (about half as much as the garlic)
I serve it family-style (like pretty much everything else around here). We enjoy it with rice and wedges of lemon or lime. Yum!