Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      medium        tomatoes -- diced
   1      medium        white onion -- diced
   8                    green onions -- finely chopped
  12      sprigs        cilantro -- finely
                        chopped
   3                    chilies serranos or -- 2 jalapenos,
                        -- minced, up to 6
                        salt to taste
     1/3  cup           grapefruit or lime juice
   1      medium        avocado -- diced
   1      teaspoon      oregano -- crumbled
     1/2  cup           cilantro -- chopped

Preparation:

Combine all ingredients. If prepared ahead of time, combine all the ingredients except the avocado, which should be added just before serving.