Chillies are available fresh, dried (whole, as flakes or ground into chilli powder), preserved in oil (where the heat from the chilli will infuse the oil) or made into condiments such as Tabasco. Fresh chillies sold in packets in supermarkets usually have a heat scale on them as a guide. When shopping for more interesting chilli varieties, farmers' markets and ethnic stores are the best hunting grounds. Look for a smooth, glossy skin that is deep in colour and firm to the touch. Discard any chillies with shrivelled skin, brown marks or watery bruises.
Some of the most common chilli varieties are:
Poblano - mildly hot, dried chilli used in the Mexican mole poblano sauce
Mulato Isleño - mildly hot chilli with a deep, sweet flavour
Ortega - elongated mildly hot New Mexican chilli, ideal for use in stews and salsas
Chipotle - mild, dried smoked chilli commonly used in Mexican cooking and commercially produced chilli sauces
Pasillas - long, very dark brown chillies, usually sold dried, then ground and added to sauces
Jalapeños - fiery chillies, used either fresh or pickled; can be dried and smoked to make chipotles towards the end of the growing season
Tabasco - hot chillies with a distinctive flavour that comes from a fermentation process in which the chillies are combined with vinegar and salt
Bird's-eye - tiny but powerful green and red chillies, especially common in Thai and South-east Asian cooking
Habañero - lantern-shaped, blow-your-head-off hot chilli, usually orange, with a slightly fruity flavour
Scotch Bonnet - lantern-shaped red-hot chilli related to the habañero, usually yellow, green or red in colour