Leftover German Sweet Sour Beef

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I got this from my mom who got it from my great grandmother...i love it but it is an acquired taste....my kids do not care for it but i get hungry for it now and then, when i have some leftover roast beef...use a pkg. Of dry onion soup mix.

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Steps

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Brown beef in butter.

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Stir in flour.

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Mix well.

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Add res of the ingredients.

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Simmer 20 minutes or until thickened --.

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Serve over hot buttered noodles.

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Ingredients

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cooked beef, flour, butter, brown sugar, ground mustard, apple cider vinegar, hot water, onion soup mix, wide egg noodles