1 c flour
1/2 tsp baking powder
115g butter, softened
1/2 c sugar
a few drops vanilla
2 tsp fresh lemon juice
1/2 tbsp finely grated lemon zest
Cream butter and sugar in a large bowl. Beat in egg and vanilla.
Add sifted dry ingredients and mix until just combined. Mix in lemon juice and zest.
Roll dough into a log in plastic wrap. Chill dough until firm.
Cut into sllices and place on baking trays. Return remaining dough to fridge.
Bake 180C for 12 minutes.