01 - Heat olive oil in a large 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 diced onion, minced garlic, sliced carrots, and sliced celery. Sauté for 5 minutes until vegetables begin to soften and release their aromas.
03 - Stir in diced red bell pepper, diced zucchini, and cut green beans. Cook for another 3 minutes to begin softening the vegetables.
04 - Return seared beef to the pot. Add diced tomatoes with juice, tomato paste, beef broth, water, dried thyme, dried oregano, bay leaves, salt, and pepper. Stir thoroughly to combine all ingredients. Bring to a boil, then reduce heat to low. Cover and simmer for 30 minutes until beef and vegetables are tender.
05 - Add orzo pasta to the simmering soup. Cook uncovered for 10 minutes, stirring occasionally to prevent sticking, until orzo reaches al dente texture.
06 - Stir fresh spinach leaves into the soup and cook for approximately 2 minutes until just wilted. Adjust seasoning with additional salt and pepper if needed. Remove and discard bay leaves before serving.
07 - Ladle hot soup into individual bowls and garnish with chopped fresh parsley. Serve immediately while hot.