1/4 cup butter or margarine
Heat butter in skillet until melted. Stir in onions, rosemary, salt and pepper. Cook over low heat, stirring frequently, until onion is very soft and begins to brown, about 20 minutes.
Arrange half of the potato slices in bottom of greased 10-inch pie plate. Top with half the onion mixture. Repeat layers. Pour half-and-half over the top. Cover with aluminum foil, and bake at 350 degrees F for 1 hour.
Uncover and bake until top is golden brown, about 20 minutes longer. Cut into wedges to serve.
Yields 6 to 8 servings.
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