Although not native to Thailand, Thai cuisine has certainly made the best use of the humble chili since arrival. The more chili you eat, the higher your tolerance.? These are medium-hot Thai chillies, known in Thailand as ‘Phrik Key Nuu’, or more commonly ‘Bird’s Eye Chillies’. They are the most common chili used in Thai cooking. Add them whole or chopped (increased hotness) to any dish to bring up the heat.