Poached Snapper With Scallion and Ginger Relish

Name: Poached Snapper With Scallion and Ginger Relish
Ingredients: 8 scallions, chopped; 1 1-inch piece ginger, sliced, plus 1 teaspoon grated ginger; 1/2 teaspoon crushed red pepper; kosher salt; 4 6-ounce boneless, skinless pieces snapper, black bass, or flounder; 2 tablespoons canola oil; 1/4 teaspoon sesame oil; 2 teaspoons soy sauce (not reduced-sodium); 1 tablespoon sherry vinegar or red wine vinegar; fresh cilantro leaves and halved snap peas, for serving; cooked rice, for serving (optional)