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 onions become translucent.
03 - Stir in red bell pepper, zucchini, and green beans. Cook for an additional 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 black pepper. Stir thoroughly to combine all ingredients.
05 - Bring mixture to a boil, then reduce heat to low. Cover and simmer for 30 minutes, or until beef becomes tender and vegetables are cooked through.
06 - Add orzo pasta to the simmering soup. 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 needed. Remove and discard bay leaves.
08 - Ladle hot soup into serving bowls. Garnish generously with chopped fresh parsley and serve immediately while hot.