Mix flour with salt and pepper. Roll ham sliced in this. Heat the butter in a large skillet. Add chopped onion and green pepper and saute until tender. Remove them from skillet. Add ham and brown on both sides. Mix the tomato soup with water. Add to the ham. Return the onion and green pepper to the skillet. Cover and simmer 15 minutes or until ham is tender. Sprinkle with most of grated cheese and heat until the cheese is melted. Add the remainder of cheese just before serving.