Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   3      large         dried ancho chilies -- seeded
   1      dried         Pasilla chile -- seeded
   1      large         onion
   2      cloves        garlic -- chopped
     1/2  teaspoon      dried oregano
     1/4  teaspoon      ground cumin
     1/4  cup           vegetable oil
     1/4  cup           distilled white vinegar
   1 1/2  teaspoons     sugar

Preparation:

Cover chilies with hot water, let sit for 15 min. Combine chilies, and 1/4 to 1/2 cup of the water they were soaking in, onion, garlic, oregano and cumin in a blender and puree. Sauté the mixture in oil for 5 min add vinegar and sugar and bring to a boil. Reduce heat, simmer until thick about 5-8 min.