Heat large wok for a few seconds and add oil. When oil becomes to shimmer, after a few seconds, add mustard seeds.
When mustard seeds begin to pop, add green chilies, crushed ginger, turmeric powder, and fry on medium heat for roughly 30 seconds.
Add shredded cabbage, salt and sugar. Fry on high heat for 5 minutes, coating it with the oil and spices till it begins to soften and acquire a pale yellow hue.