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Place the flank steak in a bowl with the cornstarch and toss to coat evenly.
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Add the flank steak to the slow cooker.
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Place the sesame oil, garlic, ginger, soy sauce, brown sugar and water in the slow cooker. Stir to coat the meat in the sauce.
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Cover and cook on HIGH for 2-3 hours or LOW for 4-5 hours.
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Stir in the green onions, then serve.
