Ginger Slices 1979

Take 6 oz self raising flour, four level teaspoonfuls ground ginger, one egg, 4 oz butter, 3 oz castor sugar, two table-spoonfuls ginger marmalade. Sieve flour and ginger and rub in butter. Add sugar and enough egg to bind mixture together. Turn on a lightly-floured surface and knead until smooth. Divide into half and form two square to fit into a greased 7 inch square tin. Place one piece in the tin and spread with the marmalade then place the remaining piece on top. Bake in moderate oven for 50 mins. Turn onto a wire tray to cool. Cover with a smooth glace icing by mixing icing sugar with water. Spread over the top and cut into slices.