Cut crust off bread, 3 slices at a time. Beat all ingredients except cayenne pepper and dill weed seed until consistency of thick icing. Spread between slices, spread thin on top slice. Cut into 4 squares. Sprinkle mixture on top and sides. Sprinkle with cayenne and dill (for less spicy, use paprika instead of cayenne).
Place on cookie sheet and freeze. Bake frozen 15-20 minutes at 350 degrees. Store in plastic bag while frozen if not using immediately. Do not microwave.