Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
3         large         dried ancho chiles -- 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 (substitute by sweetener)

Preparation:

Cover chiles with hot water, let sit for 15 min. Combine chiles, and 1/4 to 1/2 cup of the water they were soaking in, onion, garlic, oregano and cumin in a blender and puree. Saute 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.