Sbroscia or zuppa di lago is a traditional fish soup originating from the Bolsena area. The soup is usually made with a combination of fish from the Bolsena lake, mint, potatoes, onions, garlic, tomatoes, stale bread, hot peppers, olive oil, and salt.
This old dish was most commonly made by fishermen, and the lake's water is traditionally used to prepare the fish soup. The fish used in the soup are often sliced tench, eel, pike, and perch. The soup is cooked in earthenware vessels until everything is fully cooked and the consistency becomes dense.