Place dough on a lightly floured surface and let rest for 5 minutes.
Divide dough into three equal portions.
Roll each portion into a 14-inch rope.
Place ropes side by side, braid them, and tuck the ends underneath.
Transfer to a greased baking sheet, cover with a clean cloth, and let rise in a warm place until doubled (about 45–60 minutes).
Brush with egg white.
Bake in a 375°F preheated oven for 25–30 minutes, until deep golden brown.