Start rinsing the anchovy fillets under running water, then pat them dry with kitchen paper.
Repeat the above procedure with the capers. Capers comes in different sizes; if yours are big then you can roughly chop them (in this recipe I used tiny capers so I did not chop them).
Take the olives and cut them into rounds. Last, chop the parsley and set it aside; you will use it only at the end to garnish. Now, that the ingredients are ready, we start with the sauce preparation.
Put the olive oil into the pan and heat the oil on medium/low heat. Crush the garlic with the blade of your knife and add it into the pan.
Sweat the garlic off for few minutes until it is golden in colour, then remove it from the pan and discard it. Try to tilt the pan on one side and move the garlic around with a wooden spoon; it helps flavouring the oil.
Now, move your pan away from the heat and wait for about a minute to slightly cool the oil down. Then, add the anchovy fillets.
Using a wooden spoon stir and break the fillets down until they have dissolved.
Bring the pan back onto the heat, add the capers and the black olives.
Give a good stir for few seconds until the oil is hot again.
Next, add the tomatoes.
Add the chilli and stir for few seconds.
Now, cook on low heat for 15 minutes.
After 10 minutes, check for salt and season according to taste.
When the sauce is ready, sprinkle with parsley.
Stir for few seconds.
Meanwhile, you were cooking your spaghetti. Once the spaghetti is ready, drain it and add it to the sauce pan.
Stir so that all the sauce is evenly distributed.
Now, serve it straightaway.