Chile Pepper

Five domesticated species

Most chiles fall into one of five domesticated Capsicum species:

• C. annuum — the broadest group: jalapeno, bell pepper, cayenne, paprika, serrano.
• C. chinense — habaneros, scotch bonnets, ghost peppers, and the world’s hottest cultivars.
• C. baccatum — South American aji peppers; lemon-citrus notes.
• C. frutescens — tabasco, Thai bird’s eye.
• C. pubescens — rocoto, manzano; thick-walled and uniquely cold-tolerant.

Heat: the Scoville scale

Capsaicin, the compound that triggers heat receptors, is measured in Scoville Heat Units (SHU). Bell peppers register zero. Jalapenos: 2,500–8,000. Habaneros: 100,000–350,000. The current record-holder, Pepper X, exceeds 2.6 million.

A New World fruit that changed the Old World

Chiles were unknown outside the Americas until Columbus brought them back in 1493. Within a century, Portuguese traders had introduced them across India, Southeast Asia, and Africa, where they were adopted so completely that modern Indian, Thai, Korean, and Hungarian cooking are nearly unimaginable without them.

Why heat hurts but doesn’t burn

Capsaicin binds to the TRPV1 receptor, the same nerve channel activated by actual heat above 43 °C — your body genuinely thinks it’s being burned. Milk, yogurt, and rice cut the burn because casein protein and starch displace capsaicin from the receptors; water doesn’t.