Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   3      medium        tomatoes -- broiled
     1/4                onion -- roughly chopped
   1      clove         garlic -- peel and roughly
                        chop
   2      tablespoons   peanut oil
     1/4  teaspoon      salt -- or to taste

Preparation:

To broil tomatoes: Many Mexican recipes call for tomatoes to be asodos (roasted). Traditionally they are put onto a hot comal and cooked until the skin is wrinkled and brown and the flesh is soft right through -- this takes about 20 to 25 minutes for an 8-ounce tomato. However, since this method is very messy, it is best to line a shallow metal pan with foil and put the tomatoes in it. Place them under a hot broiler -- do not have the flame too high or the tomato will burn without cooking through -- and turn them from time to time so that they cook through evenly -- the skin will be blistered and charred. A medium tomato will take about 20 minutes. Blend the tomato, skin, core, and seeds to a fairly smooth sauce. The skin and core give both body and flavor to the sauce. And never mind if the skin is charred: that adds character, too. If the skin is very badly blackened and hard in places, then remove a little of it. This method of cooking tomatoes makes for a very rich-flavored sauce. Heat the oil, add the blended tomatoes and salt, and cook over a medium flame for about 8 minutes until it has thickened and is well seasoned.