Roll out the dough and place it into a tart pan with a removable bottom. Drape the dough over the pan, and gently push the dough into the corners. Once it's fitted, take a rolling pin and roll it over the top of the pan to take off any extra dough pieces around the edges. You can use the extra dough to patch any thin areas or holes if you like. Add foil or parchment paper to the top and fill it with pie weights or dried beans. Bake the pastry for 20 minutes
To make the filling, cream the butter and sugar until it's pale and fluffy. Add the egg while continually mixing. Once combined, add the two flours.
Remove the crust from the oven. Remove the pie weights and parchment or foil. Reduce the heat to 350 F. Add the apples to the crust, followed by the almond filling on top. Spread it around to fill the gaps between the apples. Return to the oven and bake for 20-25 minutes or until the top is golden brown.
Remove from the oven, top with toasted sliced almonds, and serve with vanilla ice cream, whipped cream, or creme fresh.