Separate the stems out of the core and separate the leaves from the stems. Don’t discard the leaves or the core.
Start by thinly slicing the stems. If the edges of the stems look a little bruised, then trim it off and discard.
Once you slice the stems into matchstick, chop it half. Take the core and finely chop it. Then the leaves and roughly chop it.
Peel the potato and cut into thick matchstick and then slice it half. You want the potato and the cauliflower stem to be sliced insimilar way.
In a wok pour the mustard oil and when it gets hot scatter the nigella seeds. Let it sizzle for a while then scatter the potato. Add the salt and half of the turmeric. Give a stir and cook for 2 minutes.
Add the sliced stems and the chopped core. Stir around to mix everything. In a bowl add all the spices (cumin powder, coriander powder, fennel powder, rest of the turmeric powder). Mix it with little water to form a paste. Add the spice paste to the wok and stir it around. Cover and cook for 5 minutes.
Add the chopped leaves and mix it around. Sprinkle the sugar and the green chili. Stir it around, cover and cook for 5 minutes.
Taste for salt and add any if needed. Using a fork pierce the cauliflower stems to see if it’s cooked through. It shouldn’t be mushy and should have some crunch.
Enjoy it warm with rice or roti.