Add the beef stew meat, onion, carrots, and potatoes to the slow cooker.
In a mixing bowl, stir together the garlic, ginger, Thai red curry paste, coconut milk, beef broth, fish sauce, and brown sugar until smooth.
Pour the curry mixture over the meat and vegetables in the slow cooker.
Cover and cook on low for 8 hours until the beef is tender and the vegetables are soft.
Stir in the lime juice right before serving.
Spoon the stew over cooked rice and top with fresh cilantro.