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Set the Instant Pot to Sauté and add the oil.
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Cook the onion until softened and starting to brown around the edges, then add the garlic, ginger, chillies, cardamom, and turmeric. Cook for 1 minute until fragrant until fragrant stirring constantly.
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Stir in the lentils then follow with the coconut milk and water. Stir really well and make sure you scrape the sides and bottoms down so to ensure all the lentils are covered with water.
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Cancel Sauté mode, put the lid on and set to Manual for 15 minutes. Allow a Natural Pressure Release. Give it a really good stir, crushing the lentils against the sides of the pan and it will come together to a thick purée with some whole lentils remaining.
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In a small saucepan, heat the extra oil you have and when hot add in the cumin and mustard seeds - be careful, they will sputter and split. Once sizzling, stir into the dal. Once stirred in, add a ladleful of the dal to the saucepan, swirl it about and pour back into the dal. As if by magic, any leftover seeds in the saucepan will slide right out into the pot!
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Stir in the coriander, taste and season with salt to your preference and add a squeeze of lime juice if you want a bit of bite. Serve immediately in bowls.