Place a jelly-roll pan in oven; preheat pan for 5 minutes. Sprinkle fillets evenly with 1/4 teaspoon salt and 1/4 teaspoon black pepper. Arrange fillets, skin sides down, on pan. Broil fish 5 minutes.
Combine remaining 1/8 teaspoon salt, remaining 1/4 teaspoon black pepper, bell pepper, onion, snow peas, and 1 tablespoon vinegar in a medium bowl. Arrange the bell pepper mixture on pan with fish; broil 3 minutes.
Combine the remaining 1 tablespoon rice vinegar, soy sauce, and remaining ingredients in a microwave-safe bowl. Microwave at HIGH 2 minutes. Stir; let stand 5 minutes. Discard ginger pieces. Serve sauce with fish and vegetables.
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