Spaghetti with olives and tomato sauce Recipe | Food Network UK

Ingredients

• 500g dried spaghetti
• 4 tbsps olive oil
• 180g mixed olives, pitted, halved
• 1/2 tbsp red pepper flakes, plus more if desired
• 720ml tomato sauce, recipe follows
• 60g cup grated Parmesan cheese
• 5g basil leaves, shredded
• 8 tbsps extra virgin olive oil
• 1 small onion, chopped
• 2 cloves garlic, chopped
• 1 stalk celery, chopped
• 1 carrot, chopped
• Sea salt
• freshly ground black pepper
• 2kg crushed tomatoes
• 2 dried bay leaves
• 55g unsalted butter (optional)