The articel Speculoos from the wikipedia.
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Speculoos (Dutch: Speculaas Dutch pronunciation: [speky'las] , Flemish Dutch: Speculoos , French: spéculoos , German: Spekulatius) is a type of spiced shortcrust biscuit , traditionally baked for consumption on or just before St Nicholas' feast in the Netherlands (December 5) , Belgium (December 6) ,  and Northern France and around Christmas in Germany .
In recent decades it has become available all year round .
Speculoos are thin , very crunchy , slightly browned and , most significantly , have some image or figure (often from the traditional stories about St . Nicholas) stamped on the front side before baking; the back is flat .
Speculoos dough does not rise much .
Dutch and Belgian versions are baked with light brown (beet) sugar and baking powder .
German Spekulatius uses baker's ammonia as leavening agent .
Spices used in speculoos are cinnamon , nutmeg , cloves , ginger , cardamom and white pepper .
Most Speculoos versions are made from white flour , brown sugar , butter and spices .
Some varieties use some almond flour and have slivered almonds embedded in the bottom .
Belgian varieties use less or no spice .
To make the dough , butter , sugar and spices are combined .
The flour and leavening agent are mixed separately and then added .
Bakers carefully ensure the dough doesn't heat up too quickly .
The dough is stored in a cool place overnight to give the spices time to permeate the dough and add extra flavor .
There are several interpretations for the origins of the name Speculoos .
It may derive from Latin speculum , which means mirror , and refer to the fact that the images are cut as a mirrored bas-relief into a wooden stamp which is then used to decorate the Speculoos .
Another explanation of the name refers to the Latin word speculator which , among other meanings , could also refer to a bishop or St Nicholas' epithet "he who sees everything" .
Specerij the Dutch word for spice is another possible origin .
In the United States , New Zealand and Australia , speculoos are often sold as Dutch Windmill cookies or Biscoff cookie