A Guide to the World's Great Chilli Peppers

All chilli peppers belong to the genus Capsicum and originated in the Americas, where they have been cultivated for at least 6,000 years. After Columbus brought them back to Europe in the 15th century, they spread with extraordinary speed along trade routes — reaching India, Africa, Southeast Asia and China within decades. In each new home they were embraced, adapted, and eventually became so central to local cuisine that it is now almost impossible to imagine Korean cooking without gochugaru, Thai cooking without bird's eye chillies, or Indian cooking without the Kashmiri chilli.

The heat in chillies comes from capsaicin, a compound that binds to pain receptors in the mouth and throat, triggering a burning sensation. The Scoville scale measures capsaicin concentration: a bell pepper scores 0, a jalapeño around 5,000, a bird's eye chilli around 100,000, and the Carolina Reaper (currently the world's hottest) over 2 million. But heat is only one dimension. Flavour, fruitiness, smokiness and earthiness vary enormously between varieties, which is why great chilli cooks use different peppers for different purposes.

Mexico has the most diverse and sophisticated chilli culture in the world. The ancho (a dried poblano) is earthy and mildly hot, essential for mole. The mulato is darker and more chocolatey. The guajillo is bright red with a berry-like quality, used in pozole and enchilada sauces. The chipotle is a smoked jalapeño — smoky, hot and deeply complex. The pasilla is long and dark with a raisiny, almost liquorice character. Great Mexican cooking often blends two or three dried chillies to build a sauce of genuine complexity.

In Peru, the ají amarillo is the foundation of the national cuisine — a bright orange chilli with a distinctly fruity, almost tropical flavour and a medium heat. It appears in ceviche, causa rellena, ají de gallina and dozens of other dishes. The ají panca is darker and earthier, used in anticuchos and stews. The rocoto is small and red with a fierce heat hidden beneath an almost bell-pepper sweetness.

Thailand's bird's eye chilli (prik kee noo) is tiny, fierce and aromatic — used fresh in curries, soups and salads. The longer prik chee fah is milder and used more for colour. In Korea, gochugaru (dried red pepper flakes) and gochujang (fermented red pepper paste) are the defining flavour of the cuisine — medium hot with a distinct sweetness from the fermentation. In India, the Kashmiri chilli provides vivid red colour with mild heat, while the guntur sannam of Andhra Pradesh is intensely hot.

The practical lesson: don't think of chillies as simply a heat dial. Think of them as flavour ingredients with heat as a secondary consideration. A dish made with anchos tastes fundamentally different from the same dish made with chipotles, even at the same heat level. Learning to distinguish and cook with different chilli varieties is one of the most rewarding steps any cook can take.