Blanch
the pistachios in boiling water for 1 minute. Drain
well and use a clean cloth to rub off the skins.
Let cool, then transfer to a food processor and
process until very finely chopped. Sift the flour
onto a surface and make a well in the center.
Cut
in the butter, coconut, confectioners' sugar, and
the egg and egg yolk to make a smooth dough. Wrap
in plastic wrap and refrigerate for at least 2
hours.
Divide the dough into balls the size of
walnuts. Form into crescent shapes, wrap
individually in plastic wrap, and refrigerate for 1
hour more.
Preheat the oven to 350°F/180°C/ gas 4.
Butter and flour a large baking sheet. Sprinkle
the cookies with the sugar.
Dip in the finely
chopped pistachios until well coated. Arrange on
the prepared baking sheet.
Bake for
15-20
minutes, or
until firm to the touch. Cool the cookies
completely on the baking sheet.