Heat half the oil in a wok over a high heat until just smoking.

Add one-quarter of the pork and stir-fry for 2-3 minutes or until golden brown.

Transfer to a plate.

Repeat in 3 batches with remaining pork.

Heat remaining oil in the wok over medium heat. Add onion and stir-fry for 2-3 minutes.

Add garlic and stir-fry for a minute or until aromatic.

Add soy sauce, sugar and fish sauce and stir to combine.

Simmer for 5-6 minutes or until sauce reduces and becomes syrupy.

Return pork to wok with limejuice and stir to combine.

Spoon stir-fry evenly among serving plates.

Serve immediately with bok choy, lime wedges and rice, or mash, if desired.