1. In the slow cooker, stir together the beef cubes, onion, garlic, ginger, beef broth, tomato purée, tomato paste, curry paste, ghee, lemon juice, cinnamon powder, bay leaves, salt, and pepper.
2. Once everything but the rice is combined in the slow cooker, put the lid on it and cook on low for 6 to 7 hours.
3. After that time, serve the cooked and tender beef madras over basmati rice, and enjoy!