Coat flank steak pieces in cornstarch, by either tossing in a bowl or in a bag. If possible, let meat sit after coating in cornstarch for 10-30 minutes.
Heat large skillet to medium-high heat and brown the meat, if desired. Then add the meat to the slow cooker.
Mix together the sauce ingredients - ginger, garlic, soy sauce, water, brown sugar, and carrots. Then pour sauce over meat in the slow cooker.
Cook on high for 2-3 hours or low for 4-5 hours.
Serve over cooked rice or noodles and garnish with green onion, if desired.
Freezer Meal Instructions:
Coat flank steak pieces in cornstarch and place in a gallon freezer bag, remove excess air, and seal bag.
Mix sauce ingredients together and place in a quart bag. Keep the two bags together, label, and freeze.
To serve: Thaw in refrigerator overnight. Brown meat in skillet, if desired. Then cook meat and sauce in slow cooker on high for 2-3 hours or low for 4-5 hours.