This section is from the book "Soyer's Standard Cookery", by Nicolas Soyer. Also available from Amazon: Soyer's Standard Cookery.
Make a paste by working three-quarters of a pound of butter into one pound of flour with three-quarters of a pound of moist sugar, a teaspoonful of ground cinnamon, and a pinch of salt.
Next mix half a pound of finely-chopped citron peel with half a pound of ground almonds, two pounds of powdered sugar, and three ounces of butter. Then flavor with half a spoonful of essence of vanilla and bind with the yolks of two eggs.
Roll nut the dough and divide into two parts. Place one-half on a well-buttered baking-dish, spread the mixture evenly over it, and cover with the other half of the paste. Brush with a feather dipped in beaten egg, and bake in a moderately quick oven for half an hour. When done let it cool, and then cut into convenient pieces.
 
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