In a bowl, combine the scallions, ginger, garlic and red pepper. In a small saucepan, heat the oil until shimmering. Pour the hot oil over the scallion mixture in bowl.
Add the lemon juice, soy sauce, and salt to oil mixture.
Preheat the broiler. Brush the fillets on both sides with some of the scallion oil. Arrange on a broiler pan skinned side down; broil until just cooked through, about 5 minutes. Transfer the fillets to plates; drizzle additional scallion oil on top to serve.