On a chopping board, cut the steak on an angle to make strips about a ½ inch thick. In a large frying pan, add the oil and heat. Saute the steak until it lightly browns. Drain excess fat, liberally coat the meat with ground pepper and put the meat in the crock pot. Add garlic and tamari, and mix so that the steak is thoroughly coated. Cook in a crock pot on low for 6 hours. One hour before serving, add sprouts, tomatoes, green peppers and onions and turn crock pot to high. Cook for one hour and then serve piping hot.