Finely chop the onion.

In a large pot or skillet, brown the ground beef over medium-high heat.

Add the chopped onion to the pot and cook until softened.

Drain any excess fat from the meat mixture.

Pour in the tomato sauce.

Season with oregano and other Italian seasonings to taste.

Reduce heat to low, cover, and simmer for at least 30 minutes, or longer for a richer flavor.

Bring a large pot of salted water to a boil.

Add the spaghetti to the boiling water and cook according to package directions until al dente.

Drain the spaghetti well.

Serve the spaghetti immediately with a generous portion of Bolognese sauce.

Garnish with grated parmesan cheese.