01 - Heat olive oil in a large, heavy-bottomed pan over medium heat. Sauté onion, carrot, and celery for 7 to 8 minutes until softened and translucent.
02 - Add minced garlic and cook for 1 minute, stirring frequently to release aroma.
03 - Increase heat to medium-high, add ground beef, and cook until browned, breaking it up with a spoon, about 6 to 8 minutes.
04 - Stir in tomato paste and cook for 2 minutes to enhance flavor and color.
05 - Pour in the red wine and simmer for 2 to 3 minutes, scraping the browned bits from the pan.
06 - Add crushed tomatoes, dried oregano, dried basil, bay leaf, then season with salt and pepper. Bring to a gentle simmer.
07 - Lower heat to maintain a gentle simmer, cover partially, and cook for 50 to 60 minutes, stirring occasionally.
08 - Stir in whole milk and continue simmering for another 10 minutes. Adjust seasoning to taste.
09 - Meanwhile, cook spaghetti in a large pot of salted boiling water according to package instructions until al dente. Drain well.
10 - Remove bay leaf from sauce. Toss spaghetti with a portion of sauce or serve sauce ladled over pasta. Garnish with Parmesan cheese and fresh basil if desired. Serve immediately.