1.Preheat oven to 220°C (200°C fan-forced). Oil oven tray.
2.Sift dry ingredients into large bowl; rub in the butter. Add kumara, buttermilk and enough of the water to mix to a soft, sticky dough. Knead dough lightly on floured surface until smooth.
3.Divide dough into four equal portions. Roll each portion into rounds, place on oven tray. Cut cross through top of dough, about 5mm deep. Brush tops with milk, then dust with extra sifted flour. Bake dampers about 35 minutes.