Place ingredients in the pan of the bread machine in the order recommended by the manufacturer. Select dough cycle; press Start.
When the dough cycle has finished divide into three equal portions. Roll each piece into a rope about 30cm long. Lay the three ropes side by side then plat together. Tuck the ends underneath and place onto a greased baking tray. Cover loosely with a towel and allow to rise until doubled in bulk.
Preheat oven to 180 degrees C.
Brush the plat with whisked egg whites and sprinkle with pearl sugar. Bake in preheated oven until golden brown; 20 to 25 minutes.