Cream the butter, add sugar gradually, egg well beaten, soda mixed with milk, salt and flour to make a soft dough. Chill and shape, using a round cutter. On the centres of one-half the pieces put currant jelly. Make three small openings in remaining halves, using a thimble, and put pieces together. Press edges slightly, and bake in a rather hot oven, that jumbles may keep in good shape.