This soup is most popular in Trieste and the Carso, but all evidence indicates it was created in Friuli, combining as it does the beans and corn so popular in the Bassa Friulana. You want to use very fresh corn. Check this by puncturing a kernel. If the liquid that comes out is milky, then all is well.
1cup/225gdried beans, such as cranberry, borlotti, red kidney, or pinto