Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     1/3  cup           sugar
   1      medium        onion -- finely chopped
   1 1/2  cups          boiling water
   6      ounces        tomato paste
     1/4  cup           Worcestershire sauce
     1/4  cup           vinegar
   1 1/2  teaspoons     chili powder
   1      teaspoon      dry mustard
     1/4  teaspoon      salt

Preparation:

In a medium saucepan, cook sugar over medium heat until it beings to melt, shaking pan occasionally (do not stir). Reduce heat to low and add onion. Cook and stir 5 minutes until sugar is golden brown. Carefully and gradually, add the boiling water, stirring constantly. Whisk in remaining ingredients. Bring to a boil, reduce heat, and simmer, uncovered for 10-15 minutes or until desired consistency. Brush sauce onto both sides of ribs during the last 10 minutes of grilling.