Pira caldo is a Paraguayan soup prepared with a combination of vegetables, milk, soft white cheese, and a freshwater fish called surubi. The vegetables (bell peppers, leeks, celery, onions, carrots) are first cooked with the dish, and then milk and cheese are added in order to thicken the soup.

Pira caldo is usually served as a standalone meal, not the first course because it stems from the time of war, when the people had to consume a whole day's worth of nutrients in just one meal. The word pira means fish, while caldo means broth, so this dish can be translated as fish broth.