Prepare the Beef: Cut the meat away from the short rib bones and slice into hearty chunks. If the bones have some meat left, keep them for extra flavor in the braise.
Sear the Short Ribs: In a large heavy-bottomed pot or Dutch oven, heat a thin layer of oil over medium-high heat. Once hot, brown the beef pieces on two or more sides in batches to avoid overcrowding. Allow a rich crust to develop. Set seared beef aside and return all pieces, including bones, to the pot when done.
Slow Simmer the Beef: Add ½ cup of the coconut milk along with just enough water to submerge the meat. Stir in 1 tablespoon of curry paste and 1 tablespoon of fish sauce. Bring to a gentle simmer and cover. Let it cook on low heat for 2 to 2½ hours until the beef becomes fork-tender.
Bloom the Curry Paste: In a separate pot (your curry pot), pour in about ¾ cup of the remaining coconut milk and bring it to a gentle boil. Let it reduce until thickened and glossy. Add the remaining curry paste and cook over medium-low heat, stirring constantly, until fragrant and the oil begins to separate from the paste. Deglaze with a splash of coconut milk if it starts to stick.
Build the Curry Sauce: Once the paste is bloomed, stir in the rest of the coconut milk. Add 1 tablespoon of fish sauce, all of the palm sugar, and tamarind juice. Mix well to form a balanced, rich curry base.
Combine Beef and Vegetables: Using tongs, transfer the cooked beef from the braising liquid into the curry pot. (Include bones only if they have meat you'd like to eat.) Add sweet potatoes, onions, and roasted peanuts. Skim off any excess fat and impurities from the braising liquid, then pour just enough into the curry to cover the ingredients.
Final Simmer and Season: Bring the curry to a simmer once more and cook gently for 10 to 15 minutes, until the sweet potatoes are tender. Taste and adjust the final seasoning with more fish sauce, palm sugar, or tamarind to suit your preferred balance of saltiness, sweetness, and tang.
Serve and Enjoy: Ladle the finished curry over bowls of hot jasmine rice and serve immediately. Garnish with extra peanuts or fresh herbs if desired.