Piri-piri: this sauce of Portuguese origin gets its name from a type of chilli grown in Africa. It is actually of frutescens species (which is the species used to make Tabasco sauce.) I find any mild red chilli an acceptable substitute (piri-piri chillies are anything but mild!)
The sauce is absolutely delicious and can be stirred into all sorts of savoury recipes. Below I give a couple of suggestions.