Place anchovies on a sieve, rinse cold and chop coarsely. Core the olives and cut into slices. Peel onion and garlic. Chop onion finely. Press garlic through a garlic press.
Remove the seeds from the chilli pepper and cut into fine rings. Drain capers. Heat olive oil in a pot, fry onions and garlic until transparent. Add anchovies and chilli and steam briefly. Add the chopped tomatoes, olives and capers, bring to the boil and simmer for 5-10 minutes. Meanwhile, put spaghetti in plenty of boiling salted water and cook for about 8 minutes until bubbly. Wash parsley, dab dry and chop finely, except for a little bit for garnishing. Season sauce with salt and pepper. Pour spaghetti on a sieve, drain and mix with the sauce.
Add the chopped tomatoes, olives and capers, bring to the boil and simmer for 5-10 minutes. Meanwhile, put spaghetti in plenty of boiling salted water and cook for about 8 minutes until bubbly. Wash parsley, dab dry and chop finely, except for a little bit for garnishing. Season sauce with salt and pepper. Pour spaghetti on a sieve, drain and mix with the sauce. Arrange on plates and serve with parsley, sprinkled and garnished