Prepare the Pan: Preheat the oven to 390°F (200°C). Roll out one dough disk on a lightly floured surface and place it in a 10 inch springform pan. Divide the dough roll into 2 and roll into two dough snakes and place them all the way around the dough disk. Press up the dough using your thumbs all the way to the top of the springform pan. Prick the bottom several times with a fork and chill.
Prepare the Filling: Peel and core the apples ( use an apple peeler to make this super speedy), then slice them thinly. Mix the apple immediately with lemon juice to prevent browning. Stir in sugar, cinnamon, cornstarch, and rum raisins as well as some of the rum left from soaking. If you don't want to add raisins, you can add just rum without raisins or rum essence or just skip this altogether. Mix in the almonds, ensuring the apple filling is well combined.
Apply the Glaze: Let the pie cool completely on a wire rack. For clean slices, let the cake chill in the fridge overnight, Before serving, Mix the powdered sugar with lemon juice to create a smooth glaze and brush it over the top crust with a silicon brush. Sprinkle with slivered almonds and let set in the freezer or fridge before slicing.