Step 1: Heat olive oil in a large Dutch oven or oven-safe pot over medium-high heat. Add the ground beef and cook, breaking it apart with a spoon, until browned. Drain any excess fat.
Step 2: Add the chopped onion to the pot and cook until softened, about 5-7 minutes. Stir in the minced garlic and cook for another minute until fragrant.
Step 3: Pour in the red wine (if using) and deglaze the pot, scraping up any browned bits from the bottom. Let it simmer for 2-3 minutes until mostly evaporated.
Step 4: Stir in the crushed tomatoes, diced tomatoes, beef broth, dried oregano, dried thyme, bay leaf, and cinnamon (if using). Season generously with salt and black pepper. Bring the mixture to a simmer.
Step 5: Reduce heat to low, cover, and simmer for 20 minutes, allowing the flavors to meld.
Step 6: Preheat your oven to 375°F (190°C).
Step 7: Stir the orzo pasta directly into the beef and tomato sauce in the pot. Make sure the orzo is submerged in the liquid.
Step 8: Cover the pot and transfer it to the preheated oven. Bake for 25-30 minutes, or until the orzo is cooked through and most of the liquid has been absorbed. Stir halfway through to prevent sticking.
Step 9: Remove from the oven, discard the bay leaf. Let it rest, covered, for 5-10 minutes before serving. This allows the orzo to absorb any remaining liquid and the dish to set.
Step 10: Serve hot, garnished with grated cheese and fresh parsley. Enjoy your delicious Greek beef orzo pasta!