Spaghetti con le Polpette

Ingredients

• For meatballs: 500g ground beef
• 1 large egg, beaten
• 1/2 cup breadcrumbs
• 1/4 cup grated Parmesan cheese
• 2 cloves garlic, minced
• 1 tbsp fresh parsley, chopped
• 1 tsp salt
• 1/2 tsp black pepper
• Olive oil for frying
• For sauce: 2 tbsp olive oil
• 1 onion, finely chopped
• 2 cloves garlic, minced
• 800g crushed tomatoes
• 1 tsp dried oregano
• Salt and pepper to taste
• 400g spaghetti