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Preheat the grill to high and lightly oil a large shallow heatproof dish. Arrange the fillets in the dish, slightly spaced apart, and brush them with a little oil. Grill for 2 minutes.
Remove the dish from the grill, turn the fish over and top each fillet with a scrunched slice of ham. Mix together the cheese and onions, scatter over the fish and season with salt and pepper. Return to the grill for 5 minutes until the fish flakes easily when prodded with a knife. Serve with green vegetables – broccoli or stir-fried cabbage would be good.
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