In bowl of a food processor, pulse to combine first 6 ingredients until mixture resembles slow cooking oats
Whisk together the egg and vanilla
Pour egg mixture over the flour mixture and pulse until it begins to clump together Knead gently to gather into a ball; wrap in plastic wrap and chill for a few hours or overnight
Meanwhile, make the. almond paste
Preheat the oven to 400˚F
Roll chilled pastry into an 11-inch circle between two floured pieces of parchment paper: as this is a very sticky, delicate dough: parchment paper and flour are needed to successfully work this dough into a round
Peel off paper, as needed, and sprinkle dough with flour to ensure it doesn’t stick
Line 9-inch spring-form pan with pastry, pressing it about 1½ inches up the sides. (If the pastry tears, patch it )
Dock pastry with fork and chill until firm (about 15 minutes) in freezer
Line chilled pastry with foil and fill with pie weights or dried beans; bake in preheated 400˚F oven for 15 minutes, until sides are set
Gently remove foil and weights; bake another 5 minutes, until bottom of pastry is dry
Remove from oven; reduce oven temperature to 350˚F
Meanwhile, peel and core apples