Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      tablespoons   oil
   1                    onion -- medium
   8      ounces        tomato sauce
     1/2  cup           brown sugar -- packed
     1/4  cup           vinegar -- white
   1      tablespoon    Worcestershire sauce
   4      teaspoons     chili powder
   2      teaspoons     salt
     1/2  teaspoon      mustard -- dry

Preparation:

Finely dice onion, sauté until clear. Combine all other ingredients except sugar. Cook down till thickened. Add sugar and carefully simmer until you have the correct consistency.