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1. Slice flank steak into thin 2-3 inch pieces and toss in a ziplock bag with 3 tablespoons of cornstarch.
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2. In your slow cooker, sesame oil, garlic, ginger, soy sauce, beef broth, onions, brown sugar and red pepper flakes. Stir together, then add beef and stir again.
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3. Cook for 2-3 hours on high or 4-5 hours on low. When it's just about done, remove 1/2 cup of the liquid, whisk in 1 tablespoon of cornstarch to that removed liquid. Then pour it back into the pot and stir to help thicken the sauce.
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4. Serve with rice and top with green onions and toasted sesame seeds!