Season the beef chunks generously with salt. Heat oil in a skillet over high heat and sear the beef until browned on all sides. This step adds deep flavor and is worth the extra few minutes.
Whisk together chicken stock, coconut milk, curry paste, lime juice, ginger, garlic, soy sauce, fish sauce, and brown sugar inside the slow cooker. Once the mixture is smooth, add the seared beef and make sure it’s fully submerged.
Cover and cook on high for about 6 hours, or low for 8 hours, until the beef becomes fall-apart tender. Slow cooking breaks down the meat fibers and enriches the broth.
Remove the beef, shred it with forks, and return it to the broth. Add bok choy, mushrooms, and green onions. Let them cook for about 15 minutes until soft but still vibrant.
Stir in the dried ramen noodles and continue cooking for about 15 minutes, or until the noodles are tender and have absorbed some of the broth’s flavor.
Ladle the curry ramen into bowls. Top with a soft-boiled egg, extra green onions, and toasted sesame seeds. Serve warm and enjoy the cozy flavors.