Mash hard-cooked yolks with a fork, and then beat them together with raw yolks and sugar until light and fluffy.

Alternate additions of softened butter and flour until both are fully incorporated into the dough (but do not overwork).

Chill the dough for about an hour.

Preheat the oven to 375 degrees.

Divide the dough into 12 to 15 balls, and then roll each into a rope that's 6-7 inches long.

Twist the dough rope into a wreath shape by crossing the ends of the dough.

Brush each cookie with egg white and sprinkle with pearl sugar.

Bake the cookies at 375 degrees for about 10 minutes, until lightly browned on the bottom and just done on top.

Cool completely before eating.