Wash potatoes and slice them length wise.
In a pan heat 2 tablespoon of oil on medium heat. Add the cauliflower florets and stir fry for couple of minutes. Add the sliced potatoes and cook for further 7 to 8 minutes. You should have golden spots on the florets. Drain on kitchen paper and set aside.

Add 1 tablespoon oil in the pan and add mustard and cumin seeds. Once it starts crackling add onions and cook until translucent. Add the ginger garlic paste, turmeric, chilli powder, cumin and coriander powder and tomatoes and cook for couple of minutes. Add 1/4 cup water and mix well. Add kasuri methi, cauliflower potatoes and salt and mix well. Cover and let it cook on low heat until the potatoes and cauliflower are tender. Do not over cook.

Remove and transfer in serving dish and garnish with coriander and serve hot with roti, paratha or rice.