Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/4  cup           butter
   1      medium        onion -- chopped
   2      pounds        ground beef
   2                    eggs
   2      teaspoons     salt
     1/2  teaspoon      pepper
     1/4  teaspoon      tarrogon
     1/4  teaspoon      marjoram
   2 1/2  tablespoons   flour
   5 1/2  tablespoons   tomato paste
     3/4  cup           beef stock
   4      teaspoons     worcestershire sauce
   2      teaspoons     vinegar
     1/2  pound         mushrooms -- sliced
   1      cup           sour cream

Preparation:

1. Saute onion in half the butter in large frypan until golden brown. Put the onion in the crockpot. 2. Mix together the beef, eggs, salt and pepper. Form into small balls. 3. Brown meatballs in same frypan. 4. Sprinkle on the tarragon, marjoram and flour. Shake the frypan to turn the meat balls and coat them with the flour. Put into crockpot. 5. Mix together tomato paste, beef stock, worcestershire sauce and vinegar in the frypan. Scrape the bottom of the pan and cook for two minutes. Pour over meatballs. 6. Cover and cook on low for about 1 1/2 hours. 7. Melt remaining butter in and saute mushrooms for minutes. 8. Add the mushrooms and the sour cream to the meatballs and heat through.