Add the salt and bread soda and mix all well together by running the dry ingredients through your fingers.
Add the buttermilk and stir into a soft dough with a wooden spoon.
With floured hands, knead lightly into a ball and turn out onto a lightly floured baking sheet.
Flatten the dough into a circle 3.5cm/1.5 inches thick with the palm of your hand.
Make a cross in the centre with a floured knife (to ensure the blessing of the Holy Trinity, of course!) and bake for 30 – 35 minutes, or until the top is golden brown and the bottom sounds hollow when knocked.