So, sopa de mondongo is a soup that is made with cow stomach (a part of the cow that helps digest food).
First, the stomach is cleaned out really well and then boiled for a long time with other ingredients like vegetables and spices.
After all the flavors have mixed together and the cow stomach is nice and soft, the soup is ready to be served.
It might sound weird to eat cow stomach, but it actually tastes really good and is super popular in many Latin American countries.
So, just imagine a warm and savory soup, filled with delicious vegetables and seasoned with yummy spices, all with a unique texture that comes from the cow stomach. Yum!