Two pieces of coconut shell. Now on, students of Karthika Thirunal Government Vocational and Higher Secondary School in the city have promised themselves to pack this ‘out of school' item in their school bags.

An otherwise useless material at home, these coconut shells would soon go straight into their school's brand new steam kitchen as fuel. In will go the shells into the steam boiling unit and out will come delicious ‘idlis' and ‘sambhar.'