Casserole of potato and cheese

Boil a sufficient number of potatoes to make three cupfuls when mashed. Return the mashed potatoes to a saucepan and stir over the fire, as you add slowly the beaten yolks of three eggs. When the smoking mass is hot and stiff, turn it into a greased casserole and press firmly against the sides, leaving a hollow in the middle about the size of a kitchen teacup. Brush the top and sides of the potato with the white of an egg and set in the oven until glazed and firm. Meanwhile, heat in a frying-pan or chafing-dish six tablespoonfuls of grated Parmesan cheese in a gill of milk and when hot add to it the yolk of an egg, a pinch of salt and a dash of paprika. When this cheese-sauce is thick and hot, remove the casserole from the oven, fill the hollow in the middle of the potato with the cheese mixture, sprinkle cracker-crumbs over the top of the potato and cheese and return to the oven to brown. Serve in the casserole and at once.