decorative sugar (optional)
1 egg, beaten (optional)
1 tbsp. unsalted butter (divided)
ground nutmeg
1 tsp. ground cinnamon
1/2 cup granulated sugar
1/2 tbsp. fresh lemon juice
3 cups apples
1/4 cup ice water
1/2 cup butter (cut into cubes)
1/2 tsp. fine sea salt
1 1/2 cups all-purpose flour