Soak hardtack in milk. (Skim off weevils and other objectionable matter. You may want to start this the night before, depending on age of hardtack.) When they are softened, cut salt pork into cubes and brown over medium fire. Add onion and cook until soft.  Add potatoes and water and cook until potatoes are soft, or at least tender. Stir in hardtack and milk, then add remaining ingredients. Stir and cook to almost boiling, and serve at once.