Add the flour, sugar and salt to the food processor and pulse a few times to mix.
Cut the butter into 8 slices and add to the food processor, and pulse until the dough is small crumbs. OR use a pastry cutter to cut the butter into the flour.
Dump the dough onto a floured surface and squeeze it together into a ball.
Roll and pat the dough into a thickness of 1/4 inch and cut using a cookie cutter. Reroll the scraps to use up all the dough.
Bake the cookies for 20 minutes, until they just start to brown on the edges.
Once the cookies are completely cool mix the lemon juice with the powdered sugar and drizzle it over the cookies. Top them off with freshly grated lemon zest.