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Begin by peeling and washing the potatoes.
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Using your mandolin, slice all the potatoes to roughly 1/4" of thickness
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Slice the onions to a similar thickness.
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In a baking dish, place 2 tablespoons each of the butter and oil.
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Start ringing the potatoes and onions around the outside of the bowl.
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After every three potatoes, add a sliced onions layer.
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Work all the way around until a circle is created around the outside of the dish.
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Move to the center and try to create a ring again following the same potatoes and onion distribution.
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Taking a brush, brush the remaining butter and oil on the top of the potatoes and onions.
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Sprinkle the salt and pepper evenly on the top of the potatoes.
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Bake in an oven at 450 degrees for approximately 50 minutes.
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Serve and enjoy!