Before you start, bring a full kettle to the boil.
Prep ginger. Heat oil in a medium pot on medium heat and cook first measure of ginger and sesame seeds for about 2 minutes, until fragrant. Add rice, boiling water measure and a pinch of salt and bring to the boil with the lid on. Once boiling, reduce to lowest heat to cook for 12 minutes. Turn off heat and steam, covered, for 5 more minutes. Do not lift lid during cooking.
In a medium bowl, mix all meatball ingredients together (except oil) until well combined. Scoop out heaped tablespoon measure of mix and roll into balls. Set aside on a plate/tray.
Heat oil in a large fry-pan on medium-high heat. Cook meatballs for 8-10 minutes, turning often, until cooked through. Transfer to a plate and cover to keep warm. Wipe pan clean and reserve.
Meanwhile, prep broccoli, bok choy and carrot. Mix sauce ingredients together in a small bowl.
Return pan to high heat with oil. Cook broccoli and carrot for about 5 minutes, until nearly tender. Return beef to pan with box choy and sauce and cook a further 1-2 minutes, tossing until beef and veggies are glossy and coated.
Serve rice topped with veggies and meatballs.