This section is from the book "Miss Leslie's New Cookery Book", by Eliza Leslie. Also available from Amazon: Miss Leslie's new cookery book.
In making very fine plum cake first prepare the fruit and spice, and sift the flour (which must be the very best superfine,) into a large flat dish, and dry it before the fire. Use none but the very best fresh butter; if of inferior quality, the butter will taste through every thing, and spoil the cake. In fact, all the ingredients should be excellent, and liberally allowed. Take the best bloom or muscatel raisins, seeded and cut in half. Pick and wash the currants or plums through two waters, and dry them well. Powder the spice, and let it infuse over night in the wine and brandy. Cut the citron into slips, mix it with the raisins and currants, and dredge all the fruit very thickly, on both sides, with flour. This will prevent its sinking or clodding in the cake, while baking. Eggs should always be beaten till the frothing is over, and till they become thick and smooth, as thick as a good boiled custard, and quite smooth on the surface, If you can obtain hickory-rods as egg-beaters, there is nothing so good; but if you cannot get them, use the common egg-beaters, of thin fine wire. For stirring butter and sugar you should have a spaddle, which resembles a short mush-stick flattened at one end. Stir the butter and sugar in a deep earthen pan, and continue till it is light, thick, and creamy. Beat eggs always in a broad shallow earthen pan, and with a short quick stroke, keeping your right elbow close to your side, and moving only your wrist. In this way you may beat for an hour without fatigue. But to stir butter and sugar is the hardest part of cake making. Have this done by a man servant. His strength will accomplish it in a short time - also, let him give the final stirring to the cake. If the ingredients are prepared as far as practicable on the preceding day, the cake may be in the oven by ten or eleven o'clock in the forenoon.
For a large plum cake allow one pound, (or a quart) of sifted flour; one pound of fresh butter cut up in a pound of powdered loaf sugar, in a deep pan; twelve eggs; two pounds of bloom raisins; two pounds of Zante currants; half a pound of citron, either cut into slips or chopped small; a table-spoonful of powdered mace and cinnamon, mixed; two grated nutmegs; a large wine-glass of madeira (or more), a wine-glass of French brandy, mixed together, and the spice steeped in it.
First stir the butter and sugar to a light cream, and add to them the spice and liquor. Then beat the eggs in a shallow pan till very thick and smooth, breaking them one at a time into a saucer to ascertain if there is a bad one among them. One stale egg will spoil the whole cake. When the eggs are very light, stir them gradually into the large pan of butter and sugar in turn with the flour, that being the mixing pan. Lastly, add the fruit and citron, a little at a time of each, and give the whole a hard stirring. If the fruit is well floured it will not sink, but it will be seen evenly dispersed all over the cake when baked. Take a large straight-sided block tin pan, grease it inside with the same butter used for the cake, and put the mixture carefully into it. Set it immediately into a well-heated oven, and keep up a steady heat while it is baking. When nearly done, the cake will shrink a little from the sides of the pan; and on probing it to the bottom with a sprig from a corn broom, or a splinter-skewer, the probe will come out clean. Otherwise, keep the cake in the oven a little longer. If it cracks on the top, it is a proof of its being very light. When quite done, take it out. It will become hard if left to grow cold with the oven. Set it to cool on an inverted sieve.
 
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