Preheat oven to 350° F.and grease a 1-quart casserole.
In a medium-size bowl, combine potatoes, butter, honey, and salt; stir to a creamy consistency.
Add egg yolks, milk, lemon peel, and juice.
Mix well, then fold in egg whites.
Pour into casserole and bake in preheated oven for about 25 minutes.