I'd never heard of Yum Cha before we arrived in Sydney. It has now become a firm family favourite on a Sunday, combined with a trip to visit a museum or exhibition.Ladies push trollies of dim sum around the restaurant, and as you pick delicious sounding dishes (fluffy, doughy buns filled with char sui pork and rice noodle parcels containing scallops and spring onion are our favourite) they stamp your card with their ID, ensuring they get paid for their service. A large pot of green tea washes it all down.And as any parent with impatient children will appreciate, you are tucking in within seconds of taking your seat.