Set the Instant Pot to sauté. Heat the oil in the Instant Pot and add the mustard and cumin seeds. Cook until the mustard seeds begin to pop, about 15-20 seconds. Add the onions and cook until soft and translucent about 5-7 minutes. Add the garlic, ginger and chilies (if using) and cook for another minute. Add the turmeric, chili powder, asafoetida, coriander, cinnamon and cloves and cook for a minute. Add the lentils, tomatoes, salt, black cardamom, and broth. Stir to combine. Cancel the 'sauté' setting and set to pressure cook on HIGH for 10 minutes followed by a quick release. Stir in the lime juice and cilantro, add salt to taste, and serve immediately with some fresh naan. Note: Masoor dal thickens over time and if serving as leftovers you can thin it out with a little more broth if you like.: When you start this stage you should hear a soft clicking and see the display change, indicating the pot is warming. The oil should shimmer when hot but not smoke. This brief preheat helps the mustard seeds and cumin seeds pop cleanly, ensuring the spices bloom instead of burning. If your oil begins to smoke, reduce the heat or cancel sauté for a moment to let it cool, because burnt oil will impart a bitter flavor that is hard to recover from. A common mistake is rushing this step, which leads to spices that are underdeveloped and a less fragrant dal.
Heat the oil in the Instant Pot and add the mustard and cumin seeds: You will hear the mustard seeds start to pop like tiny popcorn and smell a nutty perfume as the cumin seeds toast. Allowing those audible pops to run their course, about a few seconds, releases essential oils that brighten the dish. Avoid stirring too vigorously, because the seeds can splatter; instead tilt the inner pot away from you if splatter becomes an issue. If the seeds brown too fast, lower the heat and try again to avoid a charred taste.
Cook until the mustard seeds begin to pop, about 15 to 20 seconds: This short sensory moment is defined by crisp popping sounds and a sharp toasty scent that fills the pot, signaling readiness. Letting this go longer will deepen the flavor but risks bitterness, so watch and listen closely. A frequent error is leaving the seeds unattended, which can lead from perfect toast to burnt bitterness in seconds, so stay present.
Add the onions and cook until soft and translucent about 5 to 7 minutes: The onions should go from opaque to glossy and soft, releasing sweet aromas and a gentle sizzling sound. This transformation mellows raw sharpness and creates a sweet base that complements the spices. If your onions start to stick or brown too quickly, add a splash of broth to deglaze the pot and loosen any fond, because burnt fond will add an acrid note to the dal.
Add the garlic, ginger and chilies (if using) and cook for another minute: In this minute you will smell the garlic turn fragrant and the ginger release its bright, peppery oils, while chilies bring a fresh heat. The sizzling will be brief and lively. Overcooking these aromatics can lead to a harsh, bitter edge, so aim for translucent and fragrant rather than browned. A typical oversight is letting the garlic sit too long, which creates an unpleasant bitterness rather than the desired savory warmth.
Add the turmeric, chili powder, asafoetida, coriander, cinnamon and cloves and cook for a minute: The spices should bloom in the residual oil, releasing clean, warm aromas that layer on top of the onion and garlic. You may notice a floral citrus hint from the coriander and a warm spice from the cinnamon and cloves. This step is about coaxing essential oils from dried spices; if you overheat them they can lose vibrancy, so keep the sauté gentle. A common mistake is adding spices to a pot that is not hot enough, which prevents full flavor extraction, leaving the dish one dimensional.
Add the lentils, tomatoes, salt, black cardamom, and broth: At this point the pot will look vibrant, with the red lentils and tomatoes settling into the spice mixture. The broth should be warm or room temperature to avoid shocking the pot and splattering. The black cardamom will scent the liquid subtly as it infuses. Stir gently to combine and ensure the lentils sit evenly for consistent cooking. If you skip stirring the lentils into the spices well, you might end up with unevenly cooked pockets; stirring avoids that.
Stir to combine: You should notice a uniform orange to red color as the spices coat the lentils and tomatoes, and the mixture will sound quieter as it becomes more homogenous. This integration step helps distribute salt and aromatics so flavors cook evenly. If you hear loud bubbling or a lot of splatter, allow it to settle before sealing, because trapped splatter can trigger a burn warning in the Instant Pot. A mistake people make is not scraping the bottom well; leftover bits can trigger safety cutoffs or create uneven textures.
Cancel the 'sauté' setting and set to pressure cook on HIGH for 10 minutes followed by a quick release: Once sealed and pressurized, the pot will hum quietly; during pressure cooking the lentils will soften and break down into a creamy consistency. The high pressure extracts deep flavor quickly, producing a slow cooked richness in minutes. When you perform a quick release you will hear a rapid hiss and a rush of steam; stand back and use a long handled utensil if needed. Avoid using a natural release here unless you want a thicker result because more time under pressure will reduce liquid and concentrate the dal.
Stir in the lime juice and cilantro, add salt to taste, and serve immediately with some fresh naan: After opening the pot, the first thing you'll notice is a fragrant citrus lift from the lime , and the chopped cilantro will add herbaceous freshness and a bright green contrast. Tasting and adjusting salt at this stage is crucial because flavors settle as the dal cools. If the dal seems too thick after resting, thin with a little warmed broth to reach your desired consistency. A slip many make is adding lime too early; the acid can flatten if cooked too long, so add it at the end for maximum brightness.
Note: Masoor dal thickens over time and if serving as leftovers you can thin it out with a little more broth if you like : As the dal sits, the lentils continue to absorb liquid and the texture becomes thicker and more pudding like, which some people prefer. To revive leftover servings, warm gently and stir in broth until the texture is restored. Over thinning with cold water will cool the dish and dilute flavor; always use warm broth and reheat slowly to maintain the seasoning balance.