41.   Sprinkle on flour in handfuls until potato mixture feels fairly dry and is no longer sticky, and a small piece can be rolled easily into a ball.

42.   Stir flour into potato mixture, forming a soft dough.

43.   Stir thoroughly into the potato mixture, along with the chives, if desired.

44.   Transfer the potato mixture to the terrine.

45.   Using a slotted spoon, remove vegetables and add to the mashed potato mixture.

46.   Using a potato masher or electric mixer, whip the potato mixture until creamy.

47.   Using a rubber spatula or spoon, gently fold beaten egg whites into potato mixture.

48.   Using a potato masher, mash potato mixture until fairly smooth.

49.   When oil is hot, add potato mixture.

50.   Whip egg whites to stiff peaks and fold into potato mixture.