Place flour, salt, baking powder, and sugar in a bowl. Sift to mix and then rub in shortening and mix to a dough with 2/3 cup of water or milk. Work to a smooth dough and then roll out one-quarter inch thick. Spread with a thick cranberry conserve; roll as for jelly-roll, tucking the ends in securely. Place in a well-greased baking pan and bake in a moderate oven for ten minutes. Start basting with syrup and 4 tablespoons of water. Serve the roll with cranberry sauce.