Wash roast beef and pat dry, salt and pepper to taste.
Place 1/2 sliced onion on bottom of crock pot and one can of soup, undiluted and half of the garlic. Place beef on top of mixture, add garlic and 1/2 onion with dry gravy mix on top of beef. Pour other can of soup over all, makes its own gravy.
Cook on low at least 12-14 hours.
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