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 become fragrant.
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 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 and dissolve tomato paste.
05 - Bring mixture to a boil, then reduce heat to low. Cover pot and simmer for 30 minutes, or until beef and vegetables are tender.
06 - Stir in orzo pasta and simmer uncovered for 10 minutes, stirring occasionally to prevent sticking, until orzo is cooked al dente.
07 - Add fresh spinach leaves and stir until wilted, about 2 minutes. Taste and adjust seasoning with additional salt and pepper if needed. Remove and discard bay leaves before serving.
08 - Ladle hot soup into serving bowls. Sprinkle chopped fresh parsley over the top as garnish. Serve immediately while hot.