This spicy and delicious piri piri chicken marinade is simple to make and you can brush the marinade over the chicken as it cooks, to add even more flavor and seal in even more moisture. You will know when the chicken is done by piercing it with a sharp knife. If the juices run clear it is done. The name piri piri is sometimes spelt peri peri, and the recipe is named after the piri piri chili pepper.