In a pan, heat the olive oil.
Add the chili and fry for about 2 minutes
Mix in the garlic and anchovies and fry till the anchovies have almost melted.
Add in the chili flakes and stir for another 30 seconds.
Mix in the tomatoes, olives and capers and cook for about 10 minutes, stirring every now and again.
By which time it will thicken, add salt and black pepper and taste for seasoning.
Add the spaghetti to the sauce in your pan, adding a little reserved pasta water.
Scatter with chopped parsley and Parmesan