Heat olive oil in a large skillet over medium heat. Add chopped onion, garlic, carrot, and celery. Sauté until softened, about 5 minutes.

Add ground beef to the skillet. Cook until browned, breaking it apart with a wooden spoon, about 8-10 minutes.

Stir in crushed tomatoes, tomato paste, beef broth, oregano, basil, salt, and pepper. Bring to a simmer.

Reduce heat to low and let the sauce simmer for at least 30 minutes, stirring occasionally.

While the sauce is simmering, bring a large pot of salted water to a boil.

Add spaghetti and cook according to package instructions until al dente. Drain and set aside.

Toss the cooked spaghetti with the bolognese sauce until well coated.

Serve hot, topped with grated parmesan cheese and fresh basil.