To cook:  Preheat oven to Gas Mark 6, 200C (400F).  Sieve the dry ingredients into a big bowl.  Rub in the margarine.  Pour in the egg and buttermilk mixture and stir well.  Turn out onto a floured board and knead lightly for a minute or two.  Shape into a round, flatten slightly.

Place on a baking sheet.  Mark with a deep cross and bake in the preset oven for approx. 30-40 minutes.  Cool on a wire rack.

Recipe courtesy of Bord Bia