In a mixing bowl, combine the plain flour, bicarbonate of soda, and sugar.
Gradually add the buttermilk to the dry ingredients, mixing until a dough forms.
Shape the dough into a round disc and flatten it slightly.
Cut the disc into quarters to form farls.
Cook the farls on a hot griddle or frying pan until golden brown on both sides.
Serve warm with generous amounts of pure golden Irish butter.
