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1
Heat mustard oil in heavy-bottomed pot over medium-high heat; add cumin seeds and coriander seeds, bloom 45 seconds until fragrant and oil is fragrant.
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2
Add diced onion; cook 4 minutes until softened and translucent, then add minced ginger, garlic, and green chilies, cook 2 minutes.
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3
Stir in turmeric and chili powder; bloom 30 seconds.
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4
Add potato cubes; stir to coat evenly in spice oil and cook 3 minutes.
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5
Pour water into pot; bring to boil, then reduce to simmer, cover, and cook 18 minutes until potatoes are nearly tender.
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6
Add diced tomatoes and salt; simmer uncovered 5 minutes until potatoes are completely tender and tomatoes break down slightly.
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7
Fold in cilantro and curry leaves; serve hot as main course with rice or flatbread.