Remove bones from the mackerel, scrape the flesh with a spoon, and chop finely with a knife.

Finely chop the onion, carrot, and ginger.

Heat salad oil and ginger in a frying pan until fragrant, then add the mackerel and stir-fry over medium heat until crumbly.

Add onion and carrot, and stir-fry until the oil coats the vegetables.