Place the cauliflower florets in a bowl and pour hot water on them. Set them aside for 8-10 minutes.
Heat 3 tablespoons of Mustard Oil in a skillet or kadhai. Shallow fry the Gobi (cauliflower) and Aloo (potatoes) for 5-7 minutes. Once cooked, use a skimmer to remove them from the kadai and set them aside.
In the same kadai, add the Jeera (Cumin Seeds) to the remaining oil and let them splutter. Add whole Red Chillies, Hing (Asafoetida), Ginger, and Green Chillies. Stir-fry for a minute on low flame.
Add the Tomato Puree, Coriander Powder, Turmeric Powder, Chilli Powder and Salt. Mix well, cover, and cook for 5 minutes on medium-high flame.
Now, add the shallow-fried Gobi and Aloo along with sliced Tomatoes. Mix everything well. Cover and cook for 15-20 minutes on low flame or until the Gobi is tender. Stir 2-3 times in between.
Finally, add freshly chopped Coriander and mix on high heat for 1-2 minutes. Turn off the heat and serve hot!