Place the fish fillets in a large ovenproof dish and season well.
Scatter the sliced potatoes, tomatoes and courgettes over the fish.
Drizzle with olive oil and balsamic vinegar.
Bake in a preheated 190 °C oven for 25 to 30 minutes.
Remove from the oven and season with salt and freshly ground black pepper to taste.
Sprinkle with basil and serve with a green salad and crusty bread.
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