Posted for ZWT6. These cookies are traditionally part of the Sinterklaas celebration in Holland, which is a December 5 feast where St. Nicholas hands out treats and gifts to children. St. Nicholas was the original inspiration for today's Santa Claus. Note: These cookies are very hard for about a week after baking and will be difficult to bite into without first dunking into a beverage. They will soften with time. Yield is an estimate. Prep time does not include letting cookies sit overnight before baking.