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 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 the vegetables.
04 - Return 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.
05 - Bring mixture to a boil, then reduce heat to low. Cover pot and simmer for 30 minutes, or until beef becomes tender and vegetables are cooked through.
06 - Add orzo pasta to simmering soup. Cook 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 salt and pepper as needed. Remove and discard bay leaves before serving.
08 - Ladle hot soup into serving bowls. Garnish each portion with chopped fresh parsley. Serve immediately while hot.