Mix softened butter and granulated sugar, add lemon zest, lemon juice, vanila and salt mix until incorporated.

Add flour, mix. keep at refrigerator for 1 hour.

Roll the dough, about 1/4 inch thick, and use cookie cutter to cut

Bake for 14 - 16 minutes until the edges are lightly golden. cool completely before put the icing

Make the icing: combine sugar, lemon and milk, whisk until smooth and thick. use spoon to cover cookies with the icing. wait until the icing hardened before store at airtight container.