Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1      medium        onions -- peeled & chopped
   2      cups          lentils -- washed & drained
   1      clove         garlic -- crushed
                        bay leaf
   1      medium        carrots -- (scraped, chopped
   1 1/2  teaspoons     salt
   1      stalk         celery -- (cleaned, chopped
     1/4  teaspoon      pepper
   2      tablespoons   salad oil
   1      pound         frankfurters -- sliced thickly
   8      cups          water
   2      tablespoons   cider vinegar

Preparation:

Sauté onions, garlic, carrots, and celery in heated oil in a large kettle for 5 minutes. Add water, lentils, bay leaf, salt, and pepper. Bring to a boil. Lower heat and cook slowly, covered, about 30 minutes, until lentils are just tender. Add frankfurters and cook another 10 minutes. Remove from heat and stir in vinegar. Remove and discard bay leaf.