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. Continue cooking for another 3 minutes to begin softening the vegetables.
04 - Return the browned beef to the pot. Add diced tomatoes with their juice, tomato paste, beef broth, water, dried thyme, dried oregano, bay leaves, salt, and black pepper. Stir thoroughly to combine all ingredients.
05 - Bring the mixture to a boil, then reduce heat to low. Cover the pot and simmer for 30 minutes, or until beef is tender and vegetables have softened completely.
06 - Add orzo pasta to the simmering soup and continue cooking uncovered for 10 minutes, stirring occasionally to prevent sticking, until orzo reaches al dente texture.
07 - Stir in fresh spinach leaves and cook until wilted, approximately 2 minutes. Taste and adjust seasoning with additional salt and pepper if desired. Remove and discard bay leaves before serving.
08 - Ladle hot soup into serving bowls and garnish with chopped fresh parsley. Serve immediately while hot.