Add onion, garlic, ginger, lemongrass, and chilies into a blender. Blend until smooth. This fresh paste builds deep flavor and makes the dish smell wonderful while cooking.

Heat oil in a large pot. Add beef pieces in small batches. Cook until brown on all sides. This step adds rich taste and keeps the meat juicy.

Add the spice paste into the same pot. Stir well for three minutes. Then add turmeric, cumin, coriander, cinnamon, and star anise for warm flavor.

Pour in coconut milk and beef stock. Add brown sugar, tamarind paste, salt, and pepper. Stir everything gently until mixed well and smooth.

Return beef to the pot. Cover loosely and cook on low heat. Stir sometimes. Let it cook slowly until beef becomes tender and full of flavor.

Remove the lid for the final cooking time. Let the sauce thicken slowly. It becomes dark, rich, and coats every piece of beef beautifully.

Add lime juice and toasted coconut flakes. Stir gently. Top with fresh cilantro. Serve warm with fluffy rice for a comforting meal.