Authentic Hakka Yong Tou Foo actually is a mixture of fish paste, minced pork and salted fish. My dad used to make them and have not done so for more than a decade. Missed it so much. Very difficult to get places selling them. One place I know of is Restoran Sun Ming Kee in Taman Connaught, which sells barbequed meat rice (char siew rice, etc). This shop is famous and the owner is Hakka.