Steamed Fish with Soy Broth

Name: Steamed Fish with Soy Broth
Ingredients: 2 tablespoons sake; 2/3 cup water; 1 tablespoon soy sauce; 2 teaspoons Fortified Soy Sauce; 1 teaspoon fish sauce; 2 tablespoons plus 1 1/2 teaspoons granulated sugar, divided; 1/4 cup kosher salt; 1 1/2 pound skin-on black sea bass, snapper, or branzino, skinned and deboned, cut into 4 fillets; 1 (2-inch) piece fresh young ginger, peeled and cut into very thin strips; 1 cup canola oil; 6 scallions (green tops only), cut into thin strips; Fresh coriander flowers; 4 teaspoons Ginger-Scallion Oil