In the same pot, cook the rendang paste for 3 to 5 minutes until fragrant.
Return the beef to the pot and stir in the turmeric and nutmeg. Add the bruised lemongrass, kaffir lime leaves, and bay leaves
Pour in the coconut milk and bring to a gentle simmer. Continue cooking until the coconut milk begins to separate and release its natural oil
Reduce the heat to low, cover, and cook for 3 to 4 hours, stirring occasionally, until the beef is fork-tender and the sauce has reduced to a thick, rich consistency.
Shred or roughly chop the beef before assembling the burgers.