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1
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Place the beef roast in a deep ceramic or glass bowl. Add onions, peppercorns, cloves, and bay leaf. Pour white vinegar and cider vinegar over the meat; chill, covered, for 4 days.
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2
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Turn meat twice each day. Remove the meat from the marinade, dry it well with paper towels, and strain the marinade into a bowl. Reserve onions and 1 cup marinade.
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3
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In a Dutch oven brown the meat on all sides in hot vegetable oil. Sprinkle meat with salt.
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4
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Pour boiling water around the meat. sprinkle in crushed gingernuts, and simmer covered for 1 ½ hours. Turn often.
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5
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Add 1 cup of reserved marinade and cook meat 2 hours or more, until tender.
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6
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Remove the meat and keep it warm.
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7
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Strain the cooking juices into a large saucepan.
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8
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In a small bowl mix sour cream with flour. Stir it into the cooking juices and cook, stirring, until sauce is thickened and smooth.
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9
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Slice meat in 1cm slices; add to hot gravy. Arrange meat on a heated platter and pour extra sauce over it.
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