Combine first 7 ingredients in a zip-top plastic bag. Add fish; turn to coat. Let stand 10 minutes. Remove fish from bag. Pour marinade into a saucepan; bring to a boil and cook 1 minute.
Place fish on grill rack coated with cooking spray; cover and grill 4 minutes on each side or until fish flakes easily when tested with a fork.
Place 1/2 cup lettuce on each plate; top with fish. Spoon marinade over fish.
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