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Heat oil over medium-high heat in a large Dutch oven or high-sided skillet. Add mustard seeds. When mustard seeds begin to pop, add fenugreek and peppercorns; cook, stirring, about 30 seconds.
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Add curry leaves, chicken, garlic, vinegar, salt, cumin, coriander, cayenne pepper, and paprika; stir to combine and bring to a boil. Cover and reduce heat to low, simmer for 20 minutes.
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Uncover and increase heat to high; cook, stirring and turning, until liquid evaporates and chicken browns on all sides.