Soak the muesli in the water for 30
minutes. Rub the butter or margarine into the flour and baking powder
until the mixture resembles breadcrumbs, then stir in the raisins and
soaked muesli and mix to a soft dough. Shape into a 20 cm/8 in round
and flatten on to a greased baking (cookie) sheet. Cut partially
through into eight sections and brush with beaten egg. Bake in a
preheated oven at 230°C/450°F/gas mark 8 for about 20 minutes until
golden.