Steps
1. Cut the beef into bite-sized cubes and set aside.
2. In a pan, heat the vegetable oil over medium heat and sauté the chopped onion until translucent.
3. Add the minced garlic, ginger, turmeric, and chopped chilies; cook for 2-3 minutes until fragrant.
4. Stir in the beef cubes and cook until browned all over.
5. Add the bruised lemongrass, kaffir lime leaves, and coconut milk; bring to a simmer.
6. Mix in the tamarind paste, sugar, and salt. Cover and reduce the heat to low.
7. Simmer for 1.5 to 2 hours, stirring occasionally, until the beef is tender and the sauce thickens.
8. Taste and adjust seasoning if necessary. Serve hot, garnished with fresh coriander.