Mix the flour in a bowl with salt, sugar and vanilla, add oil, RUB everything into a large crumb, then pour a tablespoon of water and stirring with a fork, knead the dough, it should become a little wet, mash it a little hands, roll into a ball, wrap in a film and put in the refrigerator for 30 minutes.
Apples peel, cut in half, remove the core, then cut the apples into thin slices.
Turn on the oven at 220 degrees, lay a baking sheet with parchment, grease with a piece of butter.
Transfer the dough to the table sprinkled with flour, roll out a thin circle, trying not to damage the dough, wrap it on a rolling pin and transfer to a baking sheet.
Apples to lay out circles a little at each other, retreating from the edge of 4 cm, sprinkle with a little sugar (about 2 tbsp) on top lay small pieces of butter.
Then the edges gently bend to the top, a little press.
Bake a biscuit for 30-35 minutes until it is slightly browned and the apples become tender.
The finished biscuits to cool slightly on the baking sheet. Then cut with a sharp knife.