Beat the butter
and sugar in a large bowl with an electric mixer at
high speed until creamy.
Add the egg yolk, beating
until just blended. Mix in the flour, salt, and
orange juice until well blended. Refrigerate for 1
hour.
Preheat the oven to 375°F/190°C/gas 5. Butter two cookie sheets. Fit a pastry bag with a
1-inch (2.5-cm) star tip.
Fill the pastry bag,
twist the opening tightly closed, and squeeze out
four long strips on each sheet, spacing them at
least 1 inch apart on the prepared cookie sheets.
Use a sharp knife to score each strip at 2 1/2-inch
(6-cm) intervals.
Bake, one sheet at a time, for
8-10 minutes, or until just golden. Cut up the
cookies along the scored lines.
Cool on the sheet
until the cookies firm slightly. Transfer to racks
to finish cooling.