An authentic beef rendang made from scratch with meltingly tender slow-cooked beef in deep, complex spiced coconut sauce.
Process chillies, onion, garlic, lemongrass, galangal, and ginger in a food processor until a fine paste forms.
Heat oil in a large pot; brown beef in batches, then remove.
Lower heat to medium-low; cook spice paste 2-3 minutes until darkened.
Add remaining curry ingredients and beef; stir to combine.
Bring to simmer, then reduce heat to low/medium-low for a gentle bubble.
Cover and simmer for 1 hour 15 minutes.
Check beef tenderness; continue cooking if needed.
Turn heat to medium and reduce sauce 30-40 minutes, stirring frequently, until it coats the beef.
Serve with coconut rice when beef is fall-apart tender.