Warm a large pan over medium heat. Sauté the onion and garlic until they’re soft and smell amazing—around 4 minutes.
Add the minced beef. Break it up with your spoon and cook until it's browned and slightly crispy on the edges.
Pour in the canned tomatoes. Stir everything together. Add salt and pepper, and let it simmer gently for 20 minutes. Stir occasionally so nothing sticks.
Meanwhile, bring a big pot of water to a boil. Salt it like the sea and cook the spaghetti according to the package instructions.
Drain the pasta, toss it with a touch of olive oil if you like, and plate it up with a big ladle of sauce.
Top with grated parmesan and—if you're anything like me—extra black pepper.