01 -
Toss the flank steak with cornstarch in a mixing bowl until evenly coated.
02 -
Place the coated steak in a slow cooker and add sesame oil, garlic, ginger, soy sauce, brown sugar, and water. Stir gently to combine.
03 -
Cover and cook on HIGH for 2-3 hours or LOW for 4-5 hours until beef is tender.
04 -
Stir in green onions just before serving.