01 - Heat olive oil in a large soup pot or Dutch oven over medium-high heat. Add beef stew meat and sear on all sides until browned, approximately 5 minutes. Remove beef from pot and set aside.
02 - In the same pot, add onion, garlic, carrots, and celery. Sauté for 5 minutes until vegetables begin to soften and release their aromas.
03 - Stir in red bell pepper, zucchini, and green beans. Continue cooking for another 3 minutes to begin softening.
04 - Return browned beef to the pot. Add diced tomatoes with juice, tomato paste, beef broth, water, dried thyme, dried oregano, bay leaves, salt, and black pepper. Stir thoroughly to combine all ingredients. Bring mixture to a boil, then reduce heat to low. Cover and simmer for 30 minutes, or until beef and vegetables are tender.
05 - Add orzo pasta to the simmering soup. Continue cooking uncovered for 10 minutes, stirring occasionally to prevent sticking, until orzo reaches al dente texture.
06 - Stir fresh spinach into the soup and cook for approximately 2 minutes until just wilted. Taste and adjust seasoning with additional salt and pepper if needed. Remove and discard bay leaves before serving.
07 - Ladle hot soup into individual bowls. Garnish each serving with chopped fresh parsley.