Bring broth to a rapid boil and slowly add cornmeal. Stir constantly until mixture returns to a full boil. Add salt, reduce heat. Cover and cook slowly for 5 to 7 minutes.
Fry chopped deer liver, heart, and onions in butter, stirring frequently, until meat is an even color (5 to 7 minutes). Stir into cornmeal, pour mixture into a shallow baking pan and chill until it becomes firm.
Slice scrapple into 1/4-inch slices, roll in flour, and fry in butter until both sides are golden brown. Serves 4.