For Sauce: Combine all ingredients in a medium size bowl and set aside while preparing the fish. (NOTE: Do not allow the relish to stand too long or it could get watery.)
Preheat the broiler (or grill), brush the fillets with olive oil and season with salt and pepper
Place the fish in a pan large enough to keep in a single layer. Broil for about 10-11 minutes. (Test with the point of a knife for doneness).