Combine the slivered green chilies, julienned ginger, cumin seeds, and mustard seeds in a small bowl.
Heat the ghee or oil in a large nonstick pan or wok over medium-high heat.
Once hot, add the spice mixture and fry until the mustard seeds begin to pop.
Immediately add the potato spears and cauliflower florets.
Stir-fry for 4-5 minutes until they start to develop some golden-brown spots.
Stir in the quartered tomatoes, turmeric, ground coriander, garam masala, jaggery/sugar, salt, and half of the chopped cilantro.
Reduce the heat to low, cover the pan, and cook for 15-20 minutes, stirring occasionally, until the vegetables are fork-tender.
If the vegetables begin to stick, add a tablespoon or two of water, but stir gently to keep them from breaking apart.
Garnish with the remaining fresh cilantro and serve hot with fresh lime or lemon wedges on the side.
Don't Skip the Sear: That initial 4-5 minutes of stir-frying the vegetables on high heat is crucial. It creates a delicious caramelization that builds a deep, savory flavor base for the dish.