Heat oil in a heavy-bottomed pot. Add kalonji (nigella seeds) and fry on medium heat until they start to pop.
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Add crushed ginger and garlic. Fry until the raw smell fades away.
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Lower the heat and mix in turmeric, red chili, and coriander powder. Fry for 30 seconds to a minute until aromatic. If the spices stick, splash a bit of water to deglaze the pan.
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Turn the heat up and add diced chili, tomatoes, and salt. Cook until the tomatoes start to soften and break down.
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Mix in the potatoes well, ensuring they are coated in the masala.
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Pour in Β½ - 1 cup of water (just enough to cover the potatoes) and bring to a boil. Then lower the heat and simmer uncovered until the potatoes are cooked. Adjust the salt and heat to taste.
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Turn off the heat. Gently fold in diced cilantro and drizzle with lemon juice. Cover the pot with a tight lid and let it steam for an additional 5 minutes.
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Enjoy!