Place two cups of flour in a bowl and add One teaspoon of salt, Four teaspoons of baking powder, One-half cup of sugar. Sift to mix and then rub in six tablespoons of shortening. Mix to a dough with two-thirds cup of milk. Cut with a large cookie cutter and then bake in a hot oven for fifteen minutes. Split and butter, and then fill with the cooked rhubarb and serve with either plain or whipped cream or custard sauce.