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Mix the first 6 ingredients to make the marinade.
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Pour over beef and marinate in the refrigerator 2 hours to overnight.
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Preheat oven to 300.
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Heat oil in a Dutch oven on top of the stove.
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Add onions, cook briefly and then move to the side of the pan.
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Brown the beef on all sides.
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Add the potatoes, mushrooms and leftover marinade to the pan. The vegetables should be mixed with the onions with the meat on top.
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Bring to a boil.
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Cover and place in the oven.
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Check after a couple hours and add water if necessary.
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Bake around 4 hours or until the meat is falling apart tender.