Place the smashed beans, garlic, shallots, minced pork, white pepper and caster sugar into a wok and slowly cook the mixture until the pork is rendered, about 30- 45 minutes. Keep a close eye on the mixture as it will burn easily. When finished, the mixture should be able to stick together into balls. Taste the mixture and add more sugar or white pepper if needed. Roll the filling into 2-3 cm diameter balls.