Ingredients:

• 1 large yellow onion, sliced thin
• 2 ts. balsamic vinegar
• ¼ cup plus 2 ts. brown sugar
•  1 ½ cups ketchup
• ¼ cup olive oil
• ¼ cup cider vinegar
• 2 ts. lemon juice
• ¼ cup Worcestershire sauce
• 2 ts. dry mustard
• 1 ts. salt
• ¼ ts. cayenne pepper
• 3 chipotles in adobo or to taste, chopped
• ½ cup water

Instructions:

1. Place onions in a heavy dry skillet and saute over medium until they begin to brown.  Lower heat and add balsamic vinegar and 2 teaspoons of brown sugar, stirring until the onions are well coated.  Allow to simmer for 10 minutes and remove from the heat.
2. In a medium pan, whisk together remaining ingredients and cook over medium for 15 minutes or until the sauce thickens.
3. Fine chop the caramelized onions and stir into barbecue sauce.  Allow to cool.
4. Marinate meat in the sauce 1 hour before grilling and continually baste.

Comments:  A zippy BBQ sauce which is fired up with the smoky heat of chipotle chiles and sweetened with caramelized onions.  This sauce is great on ribs, chicken and pork and a light brushing on salmon as it sears on the grill will take it from just fish to delish.