Another crock pot recipe from this site.
Mix the following ingredients into a slow cooker: 1/2 cup each of brown sugar, water, soy sauce, and hoisin sauce, a finely sliced onion, some green onions chopped, and a few cloves of garlic and a small cube of root ginger finely chopped.
Coat some bite-sized slices of beef in cornstarch, and fry briefly to brown. Add to the pot. Cook on low for about 4 hours.