The super-spicy curries of Bangladeshi cuisine start out here in the chili fields, where workers harvest and sort red chili peppers by hand. Once picked, the peppers are sun-dried and used whole or ground into powder. The chilis not only add a flavorful kick to foods but help kill bacteria as well. Plus, spicy foods help diners cool down: One natural reaction to capsaicin, the active chemical in chilis, is sweating, which can help chill the skin amid tropical heat.