"Legend has it that the great Tengger Crater was dug out with just half a coconut shell by an ogre smitten with love for a princess. When the king saw that the ogre might fulfill the task he had set, which was to be completed in a single night, he ordered his servants to pound rice. This caused the cocks to start crowing, thinking the dawn had broken. The coconut that the ogre flung away became Gunung Batok, and the trench became the Sand Sea - and the ogre died of exhaustion."
From: Java a Lonely Planet travel survival kit by Peter Turner.