Cook the beef on low heat (do not cover the with a lid.)
Stir occasionally to prevent the base from burning. (When the sauce begins to thicken, stir more often and reduce the heat further if necessary.)
Continue cooking for about 2½ hours until the oil separates and the rendang becomes thicker and the colour turns richer and darker.
Check the tenderness
Test a piece of beef with a fork.
The meat should be tender and easy to break apart.