Butter a baking dish large enough to hold the fish in a single layer. Line the bottom of the dish with the potato slices. Sprinkle with 3 tablespoons of the parsley, put fish on top of potatoes. Layer onions on top of fish. Sprinkle with parsley, put fish on top of potatoes. Layer onions on top of fish. Sprinkle with parsley, rosemary, and pepper. Drizzle on oil. Bake 25 minutes at 350 degrees. Add lemon juice.
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