Combine 8 cups salted water, as you would for pasta, and Grano in a pot. Bring to a boil, then reduce heat to medium. Simmer, stirring frequently, until Grano is tender but still chewy, about 30-35 minutes. Drain well.
Saute the onion in olive oil until golden brown. Add the cooked grano, beans, tomatoes. Simmer for half an hour over low heat. Add salt to taste. Remove from pan, add cheese, drizzle with olive oil.