In a large bowl, gently combine 2 pounds apples (cored and sliced ¼-inch thick) with 3 Tablespoons sugar, 1 lemon (zested and juiced), 1 teaspoon vanilla extract, 1 teaspoon ground cardamom and ¼ cup flour.
Gently unfold and lay out 1 9-inch refrigerated pie crust on a baking sheet lined with parchment paper.
Pour the apple mixture in the center of the unfolded pie crust leaving a 2-inch border. Arrange the apples in overlapping rows or circles. Fold up the uncovered border over the edge of the fruit and pinch into pleats.
Whisk 1 egg and, using a pastry brush, brush the egg onto the crust and sprinkle with 2 Tablespoons sliced almonds and 1 teaspoon turbinado coarse sugar
Bake until apples are tender and the crust is golden, 35 to 40 minutes.
Remove from oven, let sit for 5-10 minutes, serve with a scoop of ice cream on top and enjoy!