Heat 2tbsp oil in a large skillet; add the seeds and once they start spluttering, add leeks and cook on medium flame until they turn light and limp, about 5 minutes.
Next add chopped cabbage & carrots along with turmeric; cover and cook till the veggies are tender.
Increase the flame to medium-high and let the veggies lightly brown along the edges, about 2-3 minutes. Keep stirring otherwise the veggies will burn and that is not what you want.
Add the curry powder and salt; mix well and cook on medium-high for another minute. Serve with rice or rotis.