A mixture of equal amounts of water and milk is heated with a dash of salt. Once it comes to a boil, one egg per serving is cracked into the pot without breaking the yolk, and allowed to cook for about a minute whilst covered. The soup is served in a bowl, garnished with scallions, which may be fried beforehand but usually are not, curly cilantro, and a piece of stale bread called "calado" which softens in the changua. It is sometimes served with pieces of cheese which melt into the soup.
Modern versions of "Changua" include chicken stock instead of water, tomato concassee, chopped cilantro and "Choclo" Arepas.