Process coconut, lemon grass, ginger, garlic, chilli, brown onion and oil until smooth.
Heat a 4.5-litre (18-cup) slow cooker on sear (HIGH) setting; cook paste, stirring, for 5 minutes or until well toasted and fragrant. Add beef; cook, stirring, for 8 minutes or until browned.
Add remaining ingredients to cooker; stir to combine. Cook, covered, on low, for 8 hours. Season.
Serve rendang topped with micro herbs and green onion.
