Preheat oven to 315F Gas 2-3. Brush a 28cm round pizza tray with
melted butter or oil and line with baking paper. Beat the butter and sugar with
electric beaters in a small bowl until light and creamy. Transfer to a large bowl and add the
sifted flours. Mix to a soft dough with a flat-bladed
knife, lift onto a lightly floured work surface and knead for 30
seconds, till smooth. Transfer to the pizza tray and press
into a 25cm round.
Pinch and flute around the edge with
your fingers to decorate. Prick the surface lightly with a fork
and mark into 16 segments with a sharp knife. Sprinkle with sugar and bake on the
middle shelf of the oven for 35 minutes, or till firm and lightly
golden.