A guest entering a yurt will always be given something to eat. It is extremely rude to reject the offer, but it isn't necessary to empty the bowl either. Taking a small bite or a sip satisfies the etiquette, and the rest may be returned without difficulty. An empty bowl will be refilled immediately. Food (as well as other items) are always passed and received with the right hand, while the left hand touches the right elbow for symbolic support.
Marshall Cavendish Corporation (2007) World and Its Peoples: Eastern and Southern Asia, Marshall Cavendish, p. 268 -269 ISBN 0761476334