Preheat the oven to 190°C.
Place the trout in a roasting tray. Rub all over with the olive oil and season. Arrange the pancetta cubes on top and roast the fish for 35-40 minutes until the flesh is cooked and the skin is crisp.
Remove from the oven and sprinkle with the chopped parsley. Transfer to a serving dish and garnish with a sprig of parsley leaves before serving.
For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.