To a large skillet over medium heat, brown the beef until no longer pink. Drain any grease, if necessary. Pour the cooked beef into the basin of a 6 quart slow cooker. To the slow cooker add the carrots, red bell pepper and scallions. In a medium bowl, whisk together the garlic, soy sauce, brown sugar and chicken stock. Pour the sauce into the slow cooker and stir to combine. Cover and cook on LOW for 4-6 hours. Approximately 30 minutes before serving, add the dry ramen noodles. [discard the seasoning packets, you only need the noodles.] Stir those around frequently to make sure they get all covered and cook evenly. When the noodles are tender, serve, topping with additional scallions and some sesame seeds.