Finely grated Parmesan, for serving (optional)
1/4 cup Fresh basil leaves, torn
8 oz. Cooked spaghetti
4 tbsp. Butter
1 tbsp. Dried oregano
3 pounds Fresh tomatoes, chopped
2 cloves Garlic, minced
Freshly ground black pepper
Kosher salt
1 Onion, chopped
1 tbsp. Extra virgin olive oil