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1
Combine chilies, cumin, turmeric, 1 piece of cinnamon, 5 peppercorns, 4 cloves, and sugar in a spice grinder. Grind until a fine powder is formed. Transfer spice mixture to food processor or mortar and pestle and add garlic, ginger, and vinegar. Process or pound until a fine paste is formed. Scrape out paste into a small bowl and set aside without washing food processor.
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2
Place pork in a large bowl and season with salt. Add half of spice paste and turn pork to coat. Add onion to food processor and process until a paste is formed.
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3
Heat oil in a heavy-bottomed saucepan over medium heat until shimmering. Add the onion paste (do not wash food processor bowl), remaining 4 peppercorns, remaining cinnamon stick, and remaining 3 cloves. Cook, stirring constantly, until onion is soft and oil is fragrant, about 5 minutes. Add remaining spice paste and cook, stirring occasionally, until the oil separates and mixture starts to sizzle, about 5 minutes longer.
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4
Add pork and cook, stirring occasionally, until browned, about 10 minutes. Add water to the food processor bowl and swirl to rinse. Pour mixture into pan and bring to a simmer, stirring occasionally. Reduce heat to maintain a gentle simmer, cover, and cook until the pork is fork tender, about 1 hour longer. Serve immediately with bread or rice, or for better flavor, cool, store overnight in a sealed container in the refrigerator, and reheat before serving.
