Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   1                    tomato
   3                    chilies serranos
   4      tablespoons   white onion
   1      teaspoon      salt
   2      tablespoons   coriander -- fresh
     1/3  cup           water -- cold

Preparation:

Chop the unskinned tomato and mix with everything else. Serve immediately.