01 - Place potatoes in a pot of cold salted water. Bring to a boil and simmer for 12–15 minutes until fork-tender. Drain well and allow to steam dry for 2 minutes.
02 - Mash potatoes thoroughly until smooth. While still warm, mix in butter and salt until fully incorporated.
03 - Add flour and gently knead until a soft dough forms. Add more flour if sticky. Turn onto floured surface and divide in half.
04 - Shape each half into flat round discs about ½ inch thick. Cut each round into 4 equal wedges.
05 - Heat heavy frying pan or griddle over medium heat. Lightly grease with butter. Cook farls in batches for 3–4 minutes per side until golden brown and cooked through.