01 - Heat olive oil in a large pot or Dutch oven over medium-high heat. Add beef pieces 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.
03 - Stir in red bell pepper, zucchini, and green beans. Continue cooking for an additional 3 minutes.
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.
05 - Bring mixture to a boil, then reduce heat to low. Cover and simmer for 30 minutes until beef and vegetables reach desired tenderness.
06 - Add orzo pasta to the pot and simmer uncovered for 10 minutes, stirring occasionally, until orzo is cooked al dente.
07 - Stir in fresh spinach leaves and cook until wilted, approximately 2 minutes. Adjust salt and pepper to taste.
08 - Remove and discard bay leaves. Ladle hot soup into serving bowls and garnish with freshly chopped parsley.