Place bell pepper in a 9-inch pie plate, cover with plastic wrap and vent, microwave at high 2 minutes, remove and set aside.
Wipe pie plate.
Quarter fish, arrange in pie plate, sprinkle with pepper; top with bell pepper and onion.
Microwave, uncovered, at high 7-8 minutes until fish flakes easily.
Drain and cover.
Combine salad dressing and next three ingredients in 1-cup glass measure; stir.
Microwave and high for 1 minute.
Serve sauce with fish and garnish with lemon wedges.
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