Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2       Tablespoon   Butter
   2       medium       Onions, chopped
   2       cloves       Garlic sliced
   2       Tablespoon   Flour
  14       Ounces       Tomatoes
     1/4   cup          Ground ancho or pasilla chile
   1       Tablespoon   Tarragon vinegar
   1       Tablespoon   Dried oregano
   1       Tablespoon   Brown sugar, packed

Preparation:

Melt butter in skillet. Brown onions and garlic. Stir in flour and add tomatoes, ground chile, vinegar, oregano and brown sugar. Simmer 15 minutes.