Form the dough into a ball, then flatten into a disk. Wrap in plastic wrap and refrigerate overnight. 2 Divide dough in half and soften at room temperature for 15 minutes. Line baking sheets with parchment paper. 4 Knead dough briefly to soften, adding more flour it too sticky to work with.
Transfer cookies to the prepared baking sheet.
Repeat with remaining dough. Combine pearl sugar and nuts. Brush cookies lightly with beaten egg white. Sprinkle generously with nut mixture. Cool on baking sheets for 10 minutes then transfer to rack and cool completely.