Take a tablespoonful of the mixture (this will make a croquette of the right size; large ones are likely to crack open in frying); roll it lightly between the hands into a ball. Have a plentiful supply of bread-crumbs spread evenly on a board; roll the ball lightly on the crumbs into the shape of a cylinder, and flatten each end by dropping it lightly on the board; put it in the egg (to each egg add one tablespoonful of water, and beat together), and with a spoon moisten the croquette completely with the egg; lift it out on a knife-blade, and again roll lightly in the crumbs. Have every part entirely covered, so there will be no opening through which the grease may be absorbed. Where a light yellow color is wanted, use fresh white crumbs grated from the loaf (or rubbed through a puree sieve) for the outside, and do not use the yolk of the egg. Coarse fresh crumbs are used for fish croquettes, which are usually made in the form of chops, or half heart shape. A small hole is pricked in the pointed end after frying, and a sprig of parsley inserted. For lobster croquettes a small claw is used instead of the parsley. Cracker-crumbs are used where a smooth surface is wanted. Have all the croquettes of perfectly uniform size and shape, and lay them aside on a dish, not touching one another, for an hour or more before frying. This will make the crust more firm.
The white of an egg alone may be used for egging them, but not the yolk alone. Whip the egg with the water, just enough to break it, as air-bubbles in the egg will break in frying, and let the grease penetrate.