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1
Toast dried chilies, coriander seeds, cumin seeds, black peppercorns, and fenugreek seeds in dry skillet over medium heat for 2 minutes until fragrant; grind to fine powder with mortar and pestle.
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2
Heat ghee in heavy-bottomed pot over medium-high heat; add sliced onion and cook 5 minutes until deep golden brown.
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3
Stir in ground spice blend and turmeric powder; bloom 1 minute, then add 30ml water to deglaze pot, scraping up fond.
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4
Add prepared vegetables; stir to coat evenly with spice paste and cook 3 minutes.
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5
Add remaining water and tamarind paste; bring to gentle boil, then reduce to simmer 35 minutes until vegetables are tender and liquid reduces to thin sauce consistency.
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6
Season with salt; adjust tamarind and spice balance as needed.
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7
Serve hot with steamed rice or dosa.