Source: The White House Cook Book (1887)
Cook the rice in the milk until fully tender — about thirty minutes at a simmer. The milk replaces water here and enriches the starch as it hydrates the grains, giving the finished croquette a creamy interior rather than the sandy crumb you'd get from plain water. While the rice is still hot, work in the butter, sugar, and salt with a wooden spoon until you have a smooth, cohesive mass. The heat helps the butter emulsify into the starch, binding everything together. Once you've folded in the egg yolks — add them gradually to avoid scrambling — you should have a thick paste that holds its shape. If it's too stiff to work, loosen it with another splash of milk; if it's slack, let it cool longer before shaping.
Chill the mixture completely. This isn't merely waiting — cold dough is tractable dough, and you need it firm enough to hold a ball shape through the coating stage. Once set, roll the mixture between your palms into uniform balls about the size of a walnut. Work quickly so the warmth of your hands doesn't soften them too much.
The croquette requires two coatings: a wash of beaten egg, then a crust of fine breadcrumbs or deep-frying|crushed crackers. The egg acts as both adhesive and a secondary binder; the crumbs toast during cooking into a golden shell. Dip each ball in egg, roll in crumbs, and dip again in egg and crumbs — a double coating gives a sturdier exterior that stays intact when the interior is still molten.
You have two frying routes. The traditional approach is deep-frying in about 160–170°C oil until deep golden — roughly three to four minutes — which gives you an even, crisp crust all over. The quicker method uses a mixture of butter and lard in a shallow pan on medium-high heat, turning the croquettes every couple of minutes to brown all sides. Lard's higher smoke point than butter alone prevents burning while you work through the batch. Either way, the maillard-reaction|surface browns to bitter-sweet notes that contrast the milky sweetness inside. Serve immediately while the exterior is still snap-crisp and the rice within is molten.
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