To make the meatballs, combine beef, garlic, cilantro root, fish sauce, black pepper, and soy sauce in a medium bowl. Thoroughly mix together the ingredients. Shape the beef mixture into 1-inch balls (makes about 10 meatballs).
In a medium sauce pan, fry up the curry paste for 2 minutes until fragrant.
Stir in the coconut milk, fish sauce and brown sugar.
Drop in the meatballs into the curry broth and bring to a boil. Boil the meatballs for 10 minutes and reduce to medium high heat. When the meatballs are on medium high heat, let the curry sauce reduce down for about another 5-8 minutes.