Old Fashioned Baked Beans

2 16-ounce packages of navy beans
2 cups water
Salt
½ cup packed brown sugar
2 cups chopped onion
4 teaspoons dry mustard
4 slices bacon cut into small pieces

Rinse beans. Heat beans, water, and 4 teaspoons salt to boiling. Boil 2 minutes and remove from heat. Cover and let stand 1 hour. Do not drain beans. Heat to boiling. Cover and bake at 350° for 1 hour, then stir in brown sugar and remaining ingredients and 2 teaspoons salt. Cover and bake 1 hour. Remove cover and bake another hour.