Prepare the base

• Heat the olive oil in a frying pan over medium heat.
• Add the onion, carrot and celery and cook until softened.
• Stir in the garlic and cook until fragrant.

Brown the beef

• Add the ground beef and break it up with a spoon.
• Cook until browned all over.

Build the sauce

• Pour in the red wine and let it evaporate.
• Add the tomato purée and tomato paste.
• Season with oregano, salt and pepper and stir well.

Simmer the bolognese

• Lower the heat, cover and let the sauce simmer, stirring occasionally.

Cook the spaghetti

• Bring a large pot of salted water to a boil.
• Cook the spaghetti until al dente, then drain.

Serve

• Toss the spaghetti with the bolognese sauce.
• Top with grated parmesan and serve.