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Chop the onion and the garlic.
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Put the onions and garlic in the crock pot and set the roast on the top.
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Sprinkle with the salt, pepper, rosemary and thyme.
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Pour in the wine.
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Cover and cook on the High setting until the meat is very tender about 5 hours.
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Remove the roast to a serving plate.
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Measure 2 cups of the cooking liquid into a saucepan.
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Stir together the flour and water and stir it into the cooking liquid.
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Bring to a boil, stirring, reduce the heat and simmer 10 minutes.
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Slice the roast and serve with the gravy.