In a large pot or Dutch oven, cook the ground beef over medium-high heat until browned. Transfer it to a plate and set aside, then drain any excess fat from the pot.
1 lb extra lean ground beef
Add the olive oil to the same pot, then sauté the diced onion, carrot, and celery over medium heat until softened, about 5 minutes.
1 tablespoon olive oil, 1 onion, 1 stalk celery, 1 medium carrot
Stir in the salt, pepper, red pepper flakes, thyme, and rosemary as the vegetables cook.
1 teaspoon salt, ¼ teaspoon pepper, ⅛ teaspoon crushed red pepper flakes, ½ teaspoon dried thyme, ¼ teaspoon dried rosemary
Rinse the farro under cold water, then add it to the pot with diced potatoes, beef broth, diced tomatoes (with their juices), tomato paste, bay leaves, and the optional Parmesan rind. Stir to combine, then bring the soup to a boil.
1 lb yellow potatoes, 4 cups beef broth, 1 28 oz can of diced tomatoes, 1 tablespoon tomato paste, ½ cup farro, 2 bay leaves, parmesan rind
Reduce the heat to a gentle simmer and cover with a lid and cook for about 30 minutes, stirring occasionally, until the potatoes are tender and the farro is cooked through.
Remove and discard the bay leaves and Parmesan rind. Stir in the cooked ground beef and chopped green beans (tips removed). Simmer for another 5-10 minutes, or until the green beans are tender.
2 cups chopped green beans
Taste and adjust seasoning as needed. Stir in the red wine vinegar just before serving for a little extra brightness. Serve with shaved Parmesan petals or a dollop of sour cream, and enjoy!
½ tablespoon red wine vinegar