Combine 8 cups water, salted 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.

Heat oil in a frying pan. Add pancetta, finely diced pepper and garlic. Turn down heat to simmer. Add Grano, mushrooms, and the tomatoes. Simmer for a half hour. Top with grated Parmesan cheese.