Cream the butter and sugar and egg yolks. Blend in the flour. Gather the dough into a ball and chill. Preheat the oven to 350 degrees. Break off small pieces and roll out a piece about 5 inches long and 1/3-inch thick. Form into a circle and twist or knot the ends. Continue until all the dough has been used. Brush each cookie with egg wash, sprinkle with parl sukkar (pearl sugar) and bake for 10 to 12 minutes, until just set, not browned.
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