In Kerala, a tropical slice of a state that runs along India's southwestern coast, people use every part of the coconut tree. The bark is used as firewood. The leaves and husks become mats and rope. The fruit, of course, features heavily in curries, chutneys and stews. The sweet sap can be used to make palm sugar. Or, left to ferment, it can be transformed into a special, mildly alcoholic brew called toddy.