Preheat oven to 350°F (175°C). In a bowl, mix flour and sugar; cut in butter until crumbly. Press into a tart pan.

Bake crust for about 20 minutes until golden brown. Let cool completely.

In a clean bowl, whip egg whites until soft peaks form; gradually add sugar until stiff peaks form. Fold in lemon juice.

Spread meringue over cooled crust; create swirls as desired.

Return tart to oven and bake for an additional 10-15 minutes until meringue is golden brown. Cool before slicing.