Source: The Boston Cooking-School Cook Book (1896)
Heat the white stock sauce to a simmer and fold in the cold chopped veal along with the salt, pepper, cayenne, and onion juice. The heat will firm the veal without toughening it further — you're just warming through and allowing the proteins to tighten slightly so the mixture holds its shape when cool. Stir in the egg yolk off the heat; it acts as a binder, its lecithin emulsifying the fat in the stock and veal into a cohesive paste. Spread the mixture on a cold plate and refrigerate for at least two hours, or until completely set and dense enough to hold a mould without slumping. This chill is non-negotiable — a warm or soft mixture will collapse during frying.
Once set, shape the mixture into cylinders or cones about 7 cm long, pressing firmly as you work so no gaps form inside. Handle them quickly and chill again for 30 minutes before breading. This second chill keeps the interior from softening from the warmth of your hands.
Set up your breading station: one bowl with fine dried breadcrumbs, one with beaten egg, one with more breadcrumbs. Dredge each croquette in crumbs, tap off the excess, dip it into the beaten egg until fully coated, then roll it again in crumbs, pressing gently so the second coat adheres firmly. The breading must seal completely — any gaps will let fat seep in and the interior will become greasy rather than creamy. Leave the breaded croquettes on a plate for 15 minutes; the moisture from the egg will rehydrate the outer layer slightly and glue the crumbs together.
Heat your fat to 180°C — peanut oil or clarified butter work well; lard is traditional. Test the temperature with a breadcrumb: it should sizzle immediately and colour golden in about 45 seconds. Fry the croquettes in batches of three or four so the temperature doesn't drop below 170°C. They'll need 2–3 minutes total, turning once halfway, until the surface is mahogany-brown and the crumb crust sounds crisp when you tap it. Drain on absorbent paper for no more than two minutes or the crust will soften from residual steam.
Serve immediately with tomato sauce on the side or spooned over. The contrast between the crisp exterior and the veal-and-stock interior is the whole point — delay and you lose it.
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