While this dish was very yummy, I do have to warn you against eating escolar. My husband had no adverse reactions, but I did, for about 24 hours. If you're interested to know more about what can happen, read here. I'd rather not get into further detail here.
This is a marinade that will work well on any steaky type of fish, including sea bass, tuna, swordfish, or salmon. With the escolar, the meat was tender and white, and the green garlic gathered the pungent flavors, which combined beautifully with the fish. The picture below is of the fish before baking. We baked the fish because we didn't have a grill handy, but I think this marinade would lend itself nicely to grilling.
Soy Sauce and Green Garlic Marinade
For 2 small fish steaks
1/4 cup soy sauce
2 tablespoons rice wine
1 tablespoon rice vinegar
1 teaspoon sugar
2 tablespoons sesame seeds
1 stalk green garlic, thinly sliced
Whisk all ingredients in a small bowl and pour over fish steaks. Be sure to coat the steaks on all sides. Marinade for at least 10 minutes. Bake at 375 degrees for 15 or 20 minutes, depending on the type and size of the fish steaks.