Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      cups          apple cider vinegar
     1/2  cup           sugar
   2      teaspoons     salt
   1                    whole         clove
   3      whole         allspice
   3      large         red onion -- very thinly sliced

Preparation:

Put vinegar, sugar, salt, clove, and allspice in a large nonreactive saucepan. Place over high heat and bring to boil. Put the onions in a large, nonreactive bowl and pour the boiling pickling liquid over them. Toss well. Allow to sit, tossing occasionally, until cool. Onions will wilt and turn pink. Let sit for 3-4 hours before using or refrigerate for up to 5 days.