1. Cook the spaghetti according to package instructions until al dente. Drain and set aside.

2. In a large skillet, heat olive oil over medium heat. Add minced garlic and onion, cook until softened.

3. Add ground beef and cook until browned. Stir in tomato paste, diced tomatoes, beef broth, salt, and pepper. Let it simmer.

4. Serve the Bolognese sauce over the cooked spaghetti. Sprinkle with grated Parmesan cheese and enjoy!