Boil the rice in pork stock until the rice becomes completely soft. Marinate the pork with light soy sauce and peppercorns for 20 minutes. Using your palms, shape the pork into small balls. Add to the rice soup. Season with light soy sauce and peppercorns, if desired.
When serving, beat the raw egg into the serving dish, then cover with the hot rice soup. Sprinkle with ginger slices, spring onion and coriander leaves.