Clean the mackerel and remove the bones and skin.
Thinly slice the onion and garlic.
Heat olive oil in a pan, then sauté the garlic and onion.
Add the prepared mackerel and cook over medium heat.
Add white wine or lemon juice to remove any fishy smell.
Add tomatoes and sauté together.
Boil the pasta and add it to the pan, mixing all ingredients well.
Season with salt and pepper, and finish with parsley.