Cut the pork into small bite-sized pieces and finely chop the onion.
Put the cooked rice in a bowl, crack in the egg, and add the weipa. Mix thoroughly until every grain is coated and pale yellow. Set aside.
Roughly chop the pickled takana, squeezing out excess liquid if needed.
Heat the oil in a frying pan over medium-high heat. Add the pork, season with a little salt and pepper, and cook until it changes color.
Add the onion and stir-fry until translucent.
Add the chopped takana and a splash of soy sauce and stir-fry until fragrant. Transfer the mixture to a plate and set aside.
Add a little more oil to the hot pan, tip in the egg-coated rice, and fry — pressing then tossing — until the grains separate into fluffy golden rice.
Return the takana-pork mixture to the pan and toss everything together until evenly combined and heated through. Taste and adjust.
Mound onto a plate and garnish with red pickled ginger if desired. Serve hot.