Channa Masala

1. Put the chickpeas in a large pot and add enough water to cover them by 3 to 4 inches. If time allows, soak the chickpeas for 8 to 12 hours. Put the chickpeas over high heat and bring to a boil; reduce the heat to medium-high and cook until the chickpeas are tender, 1 to 11/2 hours if you soaked them, about 2 hours if you didn't. When the chickpeas are mostly tender, add a few large pinches of salt to the pot.
2. Meanwhile, put the oil in another large pot over medium heat. When it's hot, add the cumin seeds and cook for 30 seconds. Add the onions and season with salt; cook, stirring occasionally, until they begin to soften, 3 to 5 minutes. Add the turmeric and jalapenos and continue cooking until the onions are tender, another 5 to 7 minutes. Add the ginger-garlic paste and cook, stirring occasionally, for another 5 minutes. Add the tomatoes, channa masala spice mixture, garam masala, cumin, and sugar. Cover and cook, stirring occasionally, until the mixture is thick and saucy, about 30 minues.
3. When the chickpeas are tender, drain them, reserving about 1 cup of their cooking liquid. Add the chickpeas and the reserved cooking liquid to the tomato mixture. Simmer for 5 minutes, then stir in the lemon juice and amchoor powder. Taste and adjust the seasoning. Serve hot, over basmati rice and garnished with cilantro, if desired. (Leftover channa masala can be stored in an airtight container in the refrigerator for up to several days.)