Clean and salt the turbot. Keep it in the fridge until required.
Cut the onions into thin strips.
Slice the potatoes. Fry potatoes and onions in a hot pan until golden separately
Place the potatoes and onions over a baking dish.
Place the turbot on it. Sprinkle with garlic powder and fresh parsley.
Drizzle with olive oil, white wine and salt.
Pre-heat the oven to 180ºc
Bake in oven for 1 hour