Peel and chop into chunks the turnips and boil until tender,
around 30 minutes.
Once tender, mash the turnip well and put into the baking dish.
Separate the eggs. In a bowl mix the sugar, nutmeg, egg yolks and
salt and pepper to taste.
Whisk the egg whites until stiff and fold carefully into the
sugar and egg yolk mixture.
Fold the turnip into the egg mixture.
Bake
Put into the casserole dish and smooth with the back of a spoon.
Melt the butter and add the bread-crumbs.
Spread over the top of the turnip mixture. Bake for 35-40
minutes.