Melt the butter in a skillet. Brown the onions in it. Arrange alternate layers of the potatoes, fish and onions in a buttered baking dish, starting and ending with the potatoes. As you arrange the layers, sprinkle the potatoes with one teaspoon salt and pepper. Beat the eggs, cream and remaining salt together and pour over the contents of baking dish. Bake in a 350 degree oven or until firm. Serves 6.
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