654 Biscotti puerperali

8 egg yolks
150 grams (about 5-1/4 ounces) of confectioners’ sugar
40 grams (about 1-1/3 ounces) of powdered cocoa
40 grams (about 1-1/3 ounces) of butter
a dash of vanilla sugar
Place these ingredients in a bowl, and then stir with a wooden spoon
for more than fifteen minutes. Then distribute the mixture equally
into four paper boxes, each 8 centimeters long (about 3-1/4 inches)
and 6 centimeters (about 2-2/5 inches) wide. Place these in a covered
copper baking pan with very little heat above and below, so
that the mixture solidifies without forming a crust, because you are
supposed to eat this sweet with a spoon. For this reason, the name
“cookies” is quite inappropriat