Whisk together all of the ingredients except for the beef.
Place raw beef in slow cooker, breaking into chunks with a spoon or with your fingers. Pour sauce over the beef, toss, and cover. Cook on low for 3-4 hours.
FREEZER OPTION: Place raw beef in a large zip-top bag and break apart into chunks with your fingers. Pour sauce over the beef, squeeze out the air from the bag, and freeze until ready to use. When ready to cook, thaw in refrigerator overnight. Then dump all of the ingredients into your slow cooker, cover, and cook on low for 3-4 hours.
Serve beef with sauce in lettuce wraps, over rice, or in tortillas. Garnish with sliced green onion and/or sesame seeds if desired.