KHATTI DAL (SOUR LENTILS), HYDERABAD-STYLE

Steps:

• Combine the dal, turmeric, chili, salt and 4 cups water in a large saucepan and bring to a boil. Adjust the heat so the mixture bubbles aggressively and steadily and cook, uncovered, for 25 minutes. Add the tamarind concentrate and 1/2 cup additional water, and let bubble for another minute. Turn off the heat. Use an Indian mathani (see related article) to purée the dal for about 1 minute; the dal should be saucy but not soupy. To make the tadka, heat the oil in a small saucepan over high heat. When the oil is hot, add the mustard seeds and cover the pan; let the seeds pop and sizzle. When the popping begins to subside, add the garlic and cook until lightly browned, about 15 seconds. Add the curry leaves, if you're using them. Cover the pan (to prevent spattering) and cook for about 10 seconds, allowing flavors to meld. Pour the tadka into the dal; stir gently to combine. Garnish with cilantro and serve.