You can't get more classic than Rach's Sunday Spaghetti and Meatballs.
Preheat oven to 400˚F.
For the meatballs, in a small bowl, soak bread in milk. Squeeze out excess milk and add to meat in large bowl, add remaining ingredients and roll 2 ½-inch balls and arrange on parchment-lined baking sheet. Bake to partially cook and lightly brown, 15 minutes.
For the sauce, add olive oil to a large Dutch oven over medium heat, add butter and melt. Add onions, garlic and salt, and partially cover. Sweat until very tender, 20 minutes, stirring frequently — lower heat if onions brown. Add wine and reduce by half; add stock and tomatoes, and break up tomatoes a bit. Bring to a bubble and reduce heat and simmer. Add basil and cheese rind, cook gently 30 minutes to thicken then add meatballs and keep at low simmer while you cook pasta.
Bring a large pot of water to a boil for the pasta. Salt water and cook pasta to al dente. Add a mug of cooking water to the sauce before draining pasta. Toss pasta with butter and half the sauce. Serve in shallow bowls and top with more sauce and meatballs. Pass extra cheese at the table.