Heat 2 tbsp Vegetable oil in a heavy-bottomed pot over medium heat. Sauté 1 cup Spice paste, 2 stalks bruised Lemongrass, and 4 Makrut lime leaves until fragrant, about 5 minutes.
Add the 2 lbs Beef Chuck cubes and cook until browned on all sides, about 8 to 10 minutes.
Pour in 1.5 cups Coconut milk, 1 tbsp Tamarind paste, 1 tbsp Palm sugar, and 1 tsp Salt. Bring to a gentle boil, then immediately reduce the heat to low.
Cover and simmer for 1.5 hours, stirring occasionally.
Remove the lid and continue to simmer for another 1 hour, allowing the liquid to evaporate and the oil to separate.
Stir in 1/4 cup Toasted grated coconut (kerisik). Cook for an additional 20-30 minutes until the meat is fork-tender. Serve hot with aromatic rice.