place the boquerones in ice cold water and in the fridge for 30 minutes.
In the meanwhile prepare enough liquid to cover them by mixing 50% water and 50% vinegar. Mix in salt and stir until disolve. Add more salt until it doesn't disolve anymore.
Place the biquerones in a bowl, skin side down and cover with the mixture. Place in the frige for 2 hours or until they have changes from transparent grey to white. Open one to make sure it has gone through.
drain, dry and place in a clean bowl. interlace each layer of boquerones with finely chopped garlic, parsley and piri piri. Cover with olive oil and kepp in the fridge.
It will keep for 2 weeks