Put the milk into a double boiler with the salt and a piece of cinnamon or lemon-zest. When it is at the boiling-point add the sugar; then the cornstarch and flour, which have been moistened in cold milk. Stir until thickened; remove, and turn it over the beaten yolks of the eggs. Place it on the fire again for a few minutes to set the eggs. Add the butter and flavoring, and strain it onto a flat dish, or biscuit-tin, making a layer three quarters of an inch thick. Let it stand until perfectly cold and firm (it may be made the day before it is used); then cut it into pieces three inches long and two inches wide. Handle the pieces carefully, using a broad knife-blade. Cover each one with sifted cracker-crumbs, then with egg, and again with crumbs; be sure they are completely covered. Fry the pieces in hot fat to an amber color; lay them on a brown paper in the open oven to dry, sprinkle them with sugar, and serve on a folded napkin. The crust should be crisp, and the center creamy, the same as a croquette. If the pudding stands long enough before being fried, it will not be difficult to handle. Have the fat smoking hot, and do not fry too long. This dish is recommended, as it is particularly good, and very easy to make.