How to Make It
In a large deep frying pan, heat the oil over moderate heat. Add the coriander, cumin, turmeric, and red-pepper flakes and stir. Add the cauliflower and potatoes and cook, stirring frequently, until the vegetables start to soften, about 5 minutes.
Add the tomatoes, 1/4 cup of the cilantro, the water, and the salt. Bring to a simmer, reduce the heat to low, and cook, covered, until the vegetables are tender, about 15 minutes. Stir in the peas and the remaining 1/4 cup cilantro and cook, covered, until the peas are tender, about 2 minutes longer.
Variation If you like, you can add three tablespoons dried unsweetened coconut to the curry. Put it in at the same time as the peas.