Step 1

Heat ghee in a deep skillet over medium-high heat. Fry onion until translucent, about 5 minutes. Add ginger and garlic; cook and stir until fragrant, about 1 minute. Add curry leaves, cumin, mustard seeds, and turmeric. Add potatoes, cauliflower, and chiles; cook and stir until golden brown, about 5 minutes. Add tomatoes and cover with a lid. Reduce heat to low and cook until vegetables are tender, about 20 minutes.

Step 2

Pour collard greens into the vegetable mixture; replace the lid and cook until wilted, about 2 minutes. Season with salt and pepper.