Creating cozy spicy beef rendang is simple when you follow these steps:

1. Marinate the Beef: In a large bowl, combine the beef with turmeric powder, coriander powder, cumin powder, and salt. Mix thoroughly and let it marinate for at least 30 minutes.

2. Prepare the Spice Paste: In a food processor, blend garlic, shallots, and dried red chilies into a paste. Add a little oil if needed to help blend.

3. Sauté the Paste: Heat the vegetable oil in a large pot over medium heat. Add the spice paste and sauté until fragrant, about 3-5 minutes.

4. Add Aromatics: Stir in the lemongrass, galangal, and kaffir lime leaves, continuing to cook for another minute.

5. Brown the Beef: Add the marinated beef to the pot, searing it until browned on all sides.

6. Introduce Coconut Milk: Pour in the coconut milk, ensuring it covers the meat. Add tamarind paste and brown sugar, stirring well to integrate.

7. Simmer: Bring the mixture to a gentle boil, then reduce the heat to low. Allow it to simmer uncovered for about 1.5 hours, or until the beef becomes fork-tender.

8. Reduce Sauce: Once the beef is tender, increase the heat to reduce the sauce until it thickens to your desired consistency. Stir occasionally to prevent burning.

9. Season: Taste and adjust seasoning with additional salt or sugar if needed.

10. Serve: Remove from heat and let it rest for a few minutes before serving.