Hearty Cabbage, Beef, and Lentil Soup

Combine broth, carrots, celery, and lentils in a large stockpot over medium-high heat; bring to a boil. Boil for 5 minutes, then reduce heat to low. Add cabbage, tomato sauce, diced tomatoes, thyme, oregano, salt, pepper, and bay leaf. Cover and let simmer until vegetables and lentils are cooked thoroughly, about 45 minutes.

While soup is simmering, heat a skillet over medium-high heat. Add ground beef, onion, and garlic; cook and stir until browned and crumbly and onion is soft, 5 to 7 minutes. Drain fat from the skillet; add contents to the soup. Serve.