It is another Hop-tu-naa tradition. You really do not want to know what is in Dumb cake or Soddag Valloo, to give it its Manx name. Oh, okay then.
Eggs, egg shells, flour, water, soot and salt. Yum Yum. In olden days just before going to bread on Hop-to-naa folks would divide up the cake, eat in silence (hence dumb), and walk backwards to bed. There young women would see in a dream their future husbands who would bring them a glass of water.
Anyhow, on the house, have a slice tomorrow at the Real Man Pizza restaurant in Clerkenwell as we celebrate the Celtic New Year.