Tuna Chowder

I know it sounds terrible but it is really yummy! my kids love it and it is out of the Basic Food Storage Cookbook.

Makes 1.5 quarts

INGREDIENTS:
3/4 C onions, chopped
3 Tbsp. butter
2.5 C water
1.5 Tbsp. flour
2 (7 oz) cans of tuna, drained and flaked
3/4 C celery sliced
3 C raw potatoes, diced
1.5 tsp salt
2 C milk

Brown onion and celery in butter for about 5 minutes or until tender. Add potatoes, water and salt. Heat to boiling and cook over medium heat about 15 minutes. Mix together flour and milk, then stir into potato mixture and cook until thick, stirring constantly. Add tuna fish and serve at once.