If you want to make it easy on yourself, use instant puff pastry and a jar of lemon marmelade (by the way, any marmelade will make a nice pie).
Start preparing the lemon marmelade, for it has to cool down completely. You will find the recipe here.
Preheat the oven to 200°C.
Grease and flour a baking pan and put the puff pastry in it. Put a leaf of baking paper on it, and fill it with a support stuffing of dried beans.
Bake the pastry with this stuffing for about 20 minutes, then remove the beans and the paper and bake for antoher five minuts.
Let it cool down and spread the marmelade on it.