I've made Nando's style Peri-Peri Chicken at home and it is pretty much spot on how they do it. The key thing is though, that you need to do more than just apply their Peri-Peri sauce.
I believe they do actually print the recipe on the back of some of the bottles of sauce, its probably on the internet somewhere.
Off the top of my head, you need:
- Chicken
- Nando's Peri-Peri Sauce
- Finely Chopped Garlic
- Paprika
- Lemon Juice
- Melted Butter
You basically mix it all together, then let the Chicken marinate in it for a while.
Then cook it under a grill or BBQ it.
Job done.