Place the beef stew meat, onion, garlic, ginger, carrots, bell pepper, and potatoes into the slow cooker.
In a separate bowl, whisk the coconut milk, red curry paste, beef broth, fish sauce, and brown sugar until smooth.
Pour the coconut milk mixture over the meat and vegetables in the slow cooker.
Cover and cook on low for 8 hours, until the beef is fork-tender.
Stir in the lime juice right before serving, then top each bowl with fresh cilantro.