Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      tablespoons   unsalted butter
     1/2  cup           finely diced onion
   2      cloves        garlic -- finely diced
   6                    plum tomatoes -- coarsely chopped
     1/4  cup           ketchup
   2      tablespoons   Dijon mustard
   2      tablespoons   dark brown sugar
   2      tablespoons   honey
   1      teaspoon      cayenne
   1      tablespoon    ancho chile powder
   1      tablespoon    paprika
   1      tablespoon    Worcestershire sauce
     1/2  cup           smooth peanut butter
     1/4  cup           soy sauce
   1      tablespoon    rice wine vinegar
   1      tablespoon    pureed canned chipotle

Preparation:

In a large saucepan, over medium high heat, heat the butter and sweat the onion and garlic until translucent. Add the tomatoes and simmer for 15 minutes. Add the next 8 ingredients and continue cooking for 20 minutes. Puree the mixture in a food processor, pour into a bowl and whisk in the peanut butter, soy sauce, vinegar and chipotle. Preheat grill.